What did you do to your car today?

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brushwolf

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73 Fastback Mach clone, 466, CJ Toploader
Ongoing efforts to fit a 14 inch aftermarket air cleaner with filtered top into 15 inch opening in Ram Air plenum. I have a 460 with Weiand Stealth high-rise intake, so there isn't enough room for stock type air cleaner.  Removed about 3/8 inch of laminated alternating aluminum spacers and gaskets under carb to increase total vertical space available.

Now dropped air cleaner base sits flush on reinforcement bar between shock towers (expected that..). Ordered 1/4" and 1/2" aluminum air cleaner base spacers because underside of filtered air cleaner top also hits Holley 750 air horns and can't have base sitting on shock tower cross brace either.

Obviously using either of those base spacers will reduce vertical space available again, so can't use 14 x 3 inch filter and trying to fit 14x2 filter instead (which is why the dropped base results in carb top interference with filtered top steel underside).

Have a Performer 460 intake still in the box too and I am sure that would simplify vertical space issues, but really want to keep the Weiand on it.  So, not giving up on adapting to that intake yet.

Standard aftermarket air cleaner top appears that it would fit better than filtered (thicker) top on both carb top clearance and underside of hood structure, but not sure that the 14 x 2 inch side filter can draw enough air under higher RPM (probably not over 4500-5000).  Forgot what cam is in the motor, but think it was Lunati 268H.  Trans is CJ big spline Toploader and rear is 3.55:1.

Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?

 
Joined
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Location
Madison, WI
My Car
1971 M-Code Mach 1 w/408C stroker
Ongoing efforts to fit a 14 inch aftermarket air cleaner with filtered top into 15 inch opening in Ram Air plenum. I have a 460 with Weiand Stealth high-rise intake, so there isn't enough room for stock type air cleaner.  Removed about 3/8 inch of laminated alternating aluminum spacers and gaskets under carb to increase total vertical space available.

Now dropped air cleaner base sits flush on reinforcement bar between shock towers (expected that..). Ordered 1/4" and 1/2" aluminum air cleaner base spacers because underside of filtered air cleaner top also hits Holley 750 air horns and can't have base sitting on shock tower cross brace either.

Obviously using either of those base spacers will reduce vertical space available again, so can't use 14 x 3 inch filter and trying to fit 14x2 filter instead (which is why the dropped base results in carb top interference with filtered top steel underside).

Have a Performer 460 intake still in the box too and I am sure that would simplify vertical space issues, but really want to keep the Weiand on it.  So, not giving up on adapting to that intake yet.

Standard aftermarket air cleaner top appears that it would fit better than filtered (thicker) top on both carb top clearance and underside of hood structure, but not sure that the 14 x 2 inch side filter can draw enough air under higher RPM (probably not over 4500-5000).  Forgot what cam is in the motor, but think it was Lunati 268H.  Trans is CJ big spline Toploader and rear is 3.55:1.

Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
Maybe trying an offset base will help with clearance. You may not need the spacers. If I understand correctly this idea may help.

https://www.amazon.com/Spectre-Performance-4768-Offset-Cleaner/dp/B004AJ6FD8

Check this picture of my engine. The lower picture is with a 14" filter, a 1" carb spacer, the stock cover and the offset Spectre base.

https://www.7173mustangs.com/thread-what-did-you-do-to-your-car-today?pid=298694#pid298694

 
Joined
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Springfield, OR
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1971 Mustang Sportroof M code
Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
Here's what K&N has to say about it. Scroll down to Air Filter Selection.

https://www.knfilters.com/filter_facts.htm#SELECT

 

brushwolf

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73 Fastback Mach clone, 466, CJ Toploader
I looked at those offset bases, but it looks like I would have to offset at least two inches to the rear to clear shock tower brace and that would put the 14" filter 1 1/2 inches past the rear of the ram air plenum opening and even the 2" filter needs to go up inside the plenum, at least partially.

A smaller 12" diameter filter could clear the tower brace too, but a 2 inch high filter in 12 inch diameter (if even available) would flow even less, so trying to stay with 14" diameter being it fits fairly well in plenum opening.

Like you said when you were trying to decide which way to go with yours, I am hoping to keep at least some function of Ram Air (even though they aren't exactly all that airtight to begin with, even in stock form).

If I can get the right height, I will still have roughly a 1/2 inch gap between and all around air filter outside diameter and plenum opening (I think...), but figure I can reduce that gap further by using some of the soft foam gasket material, similar to what is used on stock setups, but perhaps attach it to plenum instead of air cleaner.

Another possibility might be using some of that pinch weld push-on plastic trim material around the inside of plenum hole to reduce the gap between it and air cleaner, but still allow for a little engine moment.

Even if a small gap still exists though, I would think it would still create some outside air pressure right around the filter sides and result in cooler air ingestion than without the ram air functioning at all with just an under hood filter ingesting under hood air heated by the engine, as it has been until now.

Can't see inside there when hood is shut either, so mocking up aluminum foil pieces and shutting hood to see where clearance issues are. But, I am not actually certain that the air cleaner is dead center in the plenum opening and haven't figured out how to mock up that blind exact clearance without getting the air cleaner height problems tackled first.

Piling up a lot of air cleaner parts in this process, but I have lots of other project cars that I can probably use them on if they prove not to be needed on this one.

Thanks, Mike

 
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brushwolf

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Joined
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Messages
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Location
Minnesota
My Car
73 Fastback Mach clone, 466, CJ Toploader
Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
Here's what K&N has to say about it. Scroll down to Air Filter Selection.

https://www.knfilters.com/filter_facts.htm#SELECT
 Thanks for the link Don.  Crunching my numbers with K&N formulas indicates that with a 14x2 filter and solid top, I would be good at 2000 RPM, short by half an inch at 3500 RPM and short by 1.29 inches at 5000 RPM. (Based on 466 CI..)

That confirms my guess that the 2" filter with solid top is inadequate beyond roughly 2500 RPM, and the filtered top plate would be necessary to overcome the airflow shortfall. A 3" filter with solid top would probably suffice up to about 4500 RPM, but doubt I can squeeze that in there.

So, it looks like the filtered top has to be used if I go with the 2" filter, but the filtered top being 5/8" thicker than the solid top results in only about 3/8" total height difference between the two filter heights.

I have a 3" filter on the way too, so when the additional parts get here I will test fit them both. Have also looked at 2.5" height filters, but the airflow should be adequate with the 2" using the filtered top and the filtered top would still be necessary even with a 2.5" filter as well and fit even tighter.  

As a last resort, if neither of those prospects work out, looks like I could also remove my shock tower brace and modify (cut and re-weld) it so allows the air cleaner base to sit lower and possibly remove a 1/4" to 1/2" of the lip on the air cleaner base and maybe squeeze in the 3" filter... 

Hope it doesn't come to that, as I just put the tower brace back on after front suspension rebuild. Ram Air and filter-fitting nonsense is taking as long as whole front suspension and brake rebuild took..

:thankyouyellow:

 

downwardspiral

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LI, NY
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1973 Mach 1
2011 Mustang GT- Vortech v3 kit, custom tune and intake. MT ET Street slicks. Goes good
04 Mountaineer - daily
Ongoing efforts to fit a 14 inch aftermarket air cleaner with filtered top into 15 inch opening in Ram Air plenum. I have a 460 with Weiand Stealth high-rise intake, so there isn't enough room for stock type air cleaner.  Removed about 3/8 inch of laminated alternating aluminum spacers and gaskets under carb to increase total vertical space available.

Now dropped air cleaner base sits flush on reinforcement bar between shock towers (expected that..). Ordered 1/4" and 1/2" aluminum air cleaner base spacers because underside of filtered air cleaner top also hits Holley 750 air horns and can't have base sitting on shock tower cross brace either.

Obviously using either of those base spacers will reduce vertical space available again, so can't use 14 x 3 inch filter and trying to fit 14x2 filter instead (which is why the dropped base results in carb top interference with filtered top steel underside).

Have a Performer 460 intake still in the box too and I am sure that would simplify vertical space issues, but really want to keep the Weiand on it.  So, not giving up on adapting to that intake yet.

Standard aftermarket air cleaner top appears that it would fit better than filtered (thicker) top on both carb top clearance and underside of hood structure, but not sure that the 14 x 2 inch side filter can draw enough air under higher RPM (probably not over 4500-5000).  Forgot what cam is in the motor, but think it was Lunati 268H.  Trans is CJ big spline Toploader and rear is 3.55:1.

Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
There was a good video from engine masters* on air cleaner theory.. The filter top seems to be great because the air is already traveling at a high velocity in the direction it needs to go (down into the carb throat). They ran a literal salad bowl with just a filter top and it was at the top of the performance spectrum of their comparison.  

https://www.youtube.com/watch?v=EkpsydS8JXI

 
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Joined
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Madison, WI
My Car
1971 M-Code Mach 1 w/408C stroker
I looked at those offset bases, but it looks like I would have to offset at least two inches to the rear to clear shock tower brace and that would put the 14" filter 1 1/2 inches past the rear of the ram air plenum opening and even the 2"  filter needs to go up inside the plenum, at least partially.

A smaller 12"  diameter filter could clear the tower brace too, but a 2 inch high filter in 12 inch diameter (if even available)  would flow even less, so trying to stay with 14" diameter being it fits fairly well in plenum opening.

Like you said when you were trying to decide which way to go with yours, I am hoping to keep at least some function of Ram Air (even though they aren't exactly all that airtight to begin with, even in stock form).  

If I can get the right height, I will still have roughly a 1/2 inch gap between and all around air filter outside diameter and plenum opening  (I think...), but figure I can reduce that gap further by using some of the soft foam gasket material, similar to what is used on stock setups, but perhaps attach it to plenum instead of air cleaner.

Another possibility might be using some of that pinch weld push-on plastic trim material around the inside of plenum hole to reduce the gap between it and air cleaner, but still allow for a little engine moment.

Even if a small gap still exists though, I would think it would still create some outside air pressure right around the filter sides and result in cooler air ingestion than without the ram air functioning at all with just an under hood filter ingesting under hood air heated by the engine, as it has been until now.

Can't see inside there when hood is shut either, so mocking up aluminum foil pieces and shutting hood to see where clearance issues are.  But,  I am not actually certain that the air cleaner is dead center in the plenum opening and haven't figured out how to mock up that blind exact clearance without getting the air cleaner height problems tackled first.

Piling up a lot of air cleaner parts in this process, but I have lots of other project cars that I can probably use them on if they prove not to be needed on this one.

Thanks, Mike
Mike, I am confused because the picture that you see of my engine bay is with a 3" air cleaner, a 1" carb spacer, and the offset air cleaner base. With all these, I had no clearance issues. The whole filter fitted nicely inside the air ram cavity with space to spare.

 
Joined
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CT
My Car
73 Mustang Convertible
Ongoing efforts to fit a 14 inch aftermarket air cleaner with filtered top into 15 inch opening in Ram Air plenum. I have a 460 with Weiand Stealth high-rise intake, so there isn't enough room for stock type air cleaner.  Removed about 3/8 inch of laminated alternating aluminum spacers and gaskets under carb to increase total vertical space available.

Now dropped air cleaner base sits flush on reinforcement bar between shock towers (expected that..). Ordered 1/4" and 1/2" aluminum air cleaner base spacers because underside of filtered air cleaner top also hits Holley 750 air horns and can't have base sitting on shock tower cross brace either.

Obviously using either of those base spacers will reduce vertical space available again, so can't use 14 x 3 inch filter and trying to fit 14x2 filter instead (which is why the dropped base results in carb top interference with filtered top steel underside).

Have a Performer 460 intake still in the box too and I am sure that would simplify vertical space issues, but really want to keep the Weiand on it.  So, not giving up on adapting to that intake yet.

Standard aftermarket air cleaner top appears that it would fit better than filtered (thicker) top on both carb top clearance and underside of hood structure, but not sure that the 14 x 2 inch side filter can draw enough air under higher RPM (probably not over 4500-5000).  Forgot what cam is in the motor, but think it was Lunati 268H.  Trans is CJ big spline Toploader and rear is 3.55:1.

Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
The Stealth is not a very good street intake despite the fact it is a dual plane. Depending on cam specs you are probably better off with a regular performer with a super sucker or 3 hole spacer or the performer rpm intake. I have run both with a Lunati 227/233 @.050 cam and the regular performer makes a noticeable difference down low where as the performer rpm pulls harder and longer at the top.

 

brushwolf

Active member
Joined
Oct 19, 2017
Messages
36
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4
Location
Minnesota
My Car
73 Fastback Mach clone, 466, CJ Toploader
Ongoing efforts to fit a 14 inch aftermarket air cleaner with filtered top into 15 inch opening in Ram Air plenum. I have a 460 with Weiand Stealth high-rise intake, so there isn't enough room for stock type air cleaner.  Removed about 3/8 inch of laminated alternating aluminum spacers and gaskets under carb to increase total vertical space available.

Now dropped air cleaner base sits flush on reinforcement bar between shock towers (expected that..). Ordered 1/4" and 1/2" aluminum air cleaner base spacers because underside of filtered air cleaner top also hits Holley 750 air horns and can't have base sitting on shock tower cross brace either.

Obviously using either of those base spacers will reduce vertical space available again, so can't use 14 x 3 inch filter and trying to fit 14x2 filter instead (which is why the dropped base results in carb top interference with filtered top steel underside).

Have a Performer 460 intake still in the box too and I am sure that would simplify vertical space issues, but really want to keep the Weiand on it.  So, not giving up on adapting to that intake yet.

Standard aftermarket air cleaner top appears that it would fit better than filtered (thicker) top on both carb top clearance and underside of hood structure, but not sure that the 14 x 2 inch side filter can draw enough air under higher RPM (probably not over 4500-5000).  Forgot what cam is in the motor, but think it was Lunati 268H.  Trans is CJ big spline Toploader and rear is 3.55:1.

Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
There was a good video from engine masters* on air cleaner theory.. The filter top seems to be great because the air is already traveling at a high velocity in the direction it needs to go (down into the carb throat). They ran a literal salad bowl with just a filter top and it was at the top of the performance spectrum of their comparison.  

https://www.youtube.com/watch?v=EkpsydS8JXI

I looked at those offset bases, but it looks like I would have to offset at least two inches to the rear to clear shock tower brace and that would put the 14" filter 1 1/2 inches past the rear of the ram air plenum opening and even the 2"  filter needs to go up inside the plenum, at least partially.

A smaller 12"  diameter filter could clear the tower brace too, but a 2 inch high filter in 12 inch diameter (if even available)  would flow even less, so trying to stay with 14" diameter being it fits fairly well in plenum opening.

Like you said when you were trying to decide which way to go with yours, I am hoping to keep at least some function of Ram Air (even though they aren't exactly all that airtight to begin with, even in stock form).  

If I can get the right height, I will still have roughly a 1/2 inch gap between and all around air filter outside diameter and plenum opening  (I think...), but figure I can reduce that gap further by using some of the soft foam gasket material, similar to what is used on stock setups, but perhaps attach it to plenum instead of air cleaner.

Another possibility might be using some of that pinch weld push-on plastic trim material around the inside of plenum hole to reduce the gap between it and air cleaner, but still allow for a little engine moment.

Even if a small gap still exists though, I would think it would still create some outside air pressure right around the filter sides and result in cooler air ingestion than without the ram air functioning at all with just an under hood filter ingesting under hood air heated by the engine, as it has been until now.

Can't see inside there when hood is shut either, so mocking up aluminum foil pieces and shutting hood to see where clearance issues are.  But,  I am not actually certain that the air cleaner is dead center in the plenum opening and haven't figured out how to mock up that blind exact clearance without getting the air cleaner height problems tackled first.

Piling up a lot of air cleaner parts in this process, but I have lots of other project cars that I can probably use them on if they prove not to be needed on this one.

Thanks, Mike
Mike, I am confused because the picture that you see of my engine bay is with a 3" air cleaner, a 1" carb spacer, and the offset air cleaner base. With all these, I had no clearance issues. The whole filter fitted nicely inside the air ram cavity with space to spare.
IDK, probably the 6" height of the Stealth intake... What intake do you have? I removed all carb spacers, except two gaskets and one aluminum plate that is only .062 thick and still air cleaner top hits hood inner structure with dropped air cleaner base. Only other thing I can think of is my motor mounts being taller?

Put this motor in about 2003 and was scouring EBay daily for parts off junked 429 Mach's so would guess that is what lower mounts are from, but can't remember for sure. Do know they aren't the 351c frame mounts because those are hanging on the Cleveland which is still on a stand in my back garage..

What was the interference point before using the offset base and how much offset is the base?

Air cleaner is 14" diameter ?

Thanks, Mike

 

brushwolf

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73 Fastback Mach clone, 466, CJ Toploader
Looks like intake will indeed have to be changed for a lower height one. No combination of bases spacers and tops fit vertically with either the 2" or 3" filter. Compared intake heights on Summit site and Stealth is 6" where Performer is only 4.12. Glad I have one on the shelf already as they are $300 now.  Think when I bought it they were ~$235..

Cam is a Lunati HI268 I believe (which Summit still sells after all these years...), so Performer should be adequate for that cam (both are rated 5500 at the top of their operating range). I also have Dove heads and forged pistons which machinist took tops down a little to give me a 9.25 CR. He had ordered the Pistons for it thinking I had the later larger chamber heads..

I recall being in a quandary about whether to use the tin baffle gasket under intake, but ended up just using the fiber gaskets, thinking that carb had plenty of distance anyway on tall intake to reduce likelihood of it getting too hot (vapor lock, etc..). 1971 Lincoln Mark radiator from the same donor car as the motor fit nice in the Mustang which surprised me.

Anybody using the tin baffle and side gaskets with aluminum manifolds, or just the composition side gaskets? I probably have side gaskets here already, but don't want to take apart until sure I have any parts needed..

 
Joined
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annapolis-maryland
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73 Mustang Convertable
Only replaced the knob. Had a bugger of a time taking it out with pushing the little button in on the switch, I guess it was just sticky, and didn't wnat to put too much stress on and break something.

DSC_9265.jpg


DSC_9268.jpg


 
Joined
Aug 14, 2014
Messages
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569
Location
Madison, WI
My Car
1971 M-Code Mach 1 w/408C stroker
Ongoing efforts to fit a 14 inch aftermarket air cleaner with filtered top into 15 inch opening in Ram Air plenum. I have a 460 with Weiand Stealth high-rise intake, so there isn't enough room for stock type air cleaner.  Removed about 3/8 inch of laminated alternating aluminum spacers and gaskets under carb to increase total vertical space available.

Now dropped air cleaner base sits flush on reinforcement bar between shock towers (expected that..). Ordered 1/4" and 1/2" aluminum air cleaner base spacers because underside of filtered air cleaner top also hits Holley 750 air horns and can't have base sitting on shock tower cross brace either.

Obviously using either of those base spacers will reduce vertical space available again, so can't use 14 x 3 inch filter and trying to fit 14x2 filter instead (which is why the dropped base results in carb top interference with filtered top steel underside).

Have a Performer 460 intake still in the box too and I am sure that would simplify vertical space issues, but really want to keep the Weiand on it.  So, not giving up on adapting to that intake yet.

Standard aftermarket air cleaner top appears that it would fit better than filtered (thicker) top on both carb top clearance and underside of hood structure, but not sure that the 14 x 2 inch side filter can draw enough air under higher RPM (probably not over 4500-5000).  Forgot what cam is in the motor, but think it was Lunati 268H.  Trans is CJ big spline Toploader and rear is 3.55:1.

Any air flow guru's have any ideas about whether I would have sufficient air flow with 14 x 2 inch filter and a solid air cleaner top, as opposed to the filtered top that would seem to alleviate any potential restricted air flow issues (but is considerably more difficult to squeeze into the limited space) ?
There was a good video from engine masters* on air cleaner theory.. The filter top seems to be great because the air is already traveling at a high velocity in the direction it needs to go (down into the carb throat). They ran a literal salad bowl with just a filter top and it was at the top of the performance spectrum of their comparison.  

https://www.youtube.com/watch?v=EkpsydS8JXI

I looked at those offset bases, but it looks like I would have to offset at least two inches to the rear to clear shock tower brace and that would put the 14" filter 1 1/2 inches past the rear of the ram air plenum opening and even the 2"  filter needs to go up inside the plenum, at least partially.

A smaller 12"  diameter filter could clear the tower brace too, but a 2 inch high filter in 12 inch diameter (if even available)  would flow even less, so trying to stay with 14" diameter being it fits fairly well in plenum opening.

Like you said when you were trying to decide which way to go with yours, I am hoping to keep at least some function of Ram Air (even though they aren't exactly all that airtight to begin with, even in stock form).  

If I can get the right height, I will still have roughly a 1/2 inch gap between and all around air filter outside diameter and plenum opening  (I think...), but figure I can reduce that gap further by using some of the soft foam gasket material, similar to what is used on stock setups, but perhaps attach it to plenum instead of air cleaner.

Another possibility might be using some of that pinch weld push-on plastic trim material around the inside of plenum hole to reduce the gap between it and air cleaner, but still allow for a little engine moment.

Even if a small gap still exists though, I would think it would still create some outside air pressure right around the filter sides and result in cooler air ingestion than without the ram air functioning at all with just an under hood filter ingesting under hood air heated by the engine, as it has been until now.

Can't see inside there when hood is shut either, so mocking up aluminum foil pieces and shutting hood to see where clearance issues are.  But,  I am not actually certain that the air cleaner is dead center in the plenum opening and haven't figured out how to mock up that blind exact clearance without getting the air cleaner height problems tackled first.

Piling up a lot of air cleaner parts in this process, but I have lots of other project cars that I can probably use them on if they prove not to be needed on this one.

Thanks, Mike
Mike, I am confused because the picture that you see of my engine bay is with a 3" air cleaner, a 1" carb spacer, and the offset air cleaner base. With all these, I had no clearance issues. The whole filter fitted nicely inside the air ram cavity with space to spare.
IDK, probably the 6" height of the Stealth intake... What intake do you have? I removed all carb spacers, except two gaskets and one aluminum plate that is only .062 thick and still air cleaner top hits hood inner structure with dropped air cleaner base. Only other thing I can think of is my motor mounts being taller?

Put this motor in about 2003 and was scouring EBay daily for parts off junked 429 Mach's so would guess that is what lower mounts are from, but can't remember for sure. Do know they aren't the 351c frame mounts because those are hanging on the Cleveland which is still on a stand in my back garage..

What was the interference point before using the offset base and how much offset is the base?

Air cleaner is 14" diameter ?

Thanks, Mike
Okay, now I get it. In that picture I had a Performer, which I will be selling soon after I install the Blue Thunder, but without spacer.

I never used it without the offset. The offset is about 1 3/8".

 

brushwolf

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73 Fastback Mach clone, 466, CJ Toploader
Yeah, Performer should fit vertically with 3" it looks like. Will find out if offset is required soon on mine I guess. Found paperwork from Jeg's (2002) and I paid $168.99 for the new 460 Performer intake back then. Lists for $303 on Summit today.... So, if you had the Performer a while you will probably be able to get your full purchase price back. Inflation much?

Just pulled the Stealth intake and cleaning up gasket residue to ready for the Performer.

I've heard only good things about the Blue Thunder and considered buying one for a 390 TBird motor I built last year, but already had a vintage F427 and a Performer for that engine too (paid around $120 apiece for those off EBay sometime back around Y2k).

Bought FPA ceramic coated headers for that 390 too which I think ran over a grand alone, so buying a 3rd intake seemed foolish. So, I have the F427 intake sitting on it and probably use some of my air cleaner extra parts for that one anyway. Or maybe only bolt it on temporarily to make sure it clears the hood on TBird before installing it permanently, to avoid possibly going through all this rigamorole again...

Do you recall where your point of interference was that required you to use the offset base? Mine (so far) only showed vertical clearance issues, but maybe that will change with intake change..

 
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1971 M-Code Mach 1 w/408C stroker
Yeah, Performer should fit vertically with 3" it looks like.  Will find out if offset is required soon on mine I guess. Found paperwork from Jeg's (2002) and I paid $168.99 for the new 460 Performer  intake back then. Lists for $303 on Summit today....  So, if you had the Performer a while you will probably be able to get your full purchase price back.  Inflation much?

Just pulled the Stealth intake and cleaning up gasket residue to ready for the Performer.  

I've heard only good things about the Blue Thunder and considered buying one for a 390 TBird motor I built last year, but already had a vintage F427 and a Performer for that engine too (paid around $120 apiece for those off EBay sometime back around Y2k).

Bought FPA ceramic coated headers for that 390 too which I think ran over a grand alone, so buying a 3rd intake seemed foolish.  So, I have the F427 intake sitting on it and probably use some of my air cleaner extra parts for that one anyway. Or maybe only bolt it on temporarily to make sure it clears the hood on TBird before installing it permanently, to avoid possibly going through all this rigamorole again...

Do you recall where your point of interference was that required you to use the offset base? Mine (so far) only showed vertical clearance issues, but maybe that will change with intake change..
To be honest, I just went directly to offset. I know I had interference, so never checked where was it. At the end, I am still using the factory ram air filter base. I have the offset in case I want to change the look.

 
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