Which 351C 4v do I have?

[dhvidston]

Hi all.

Restoring a 1971 Mach1 "M" code.. or so I thought!

Was stripping the motor to repaint and found the casting numbers under the block.

D2AE-CA and 2 J 9... unfortunately, I thinks this must mean my original motor was replace with a 1972 motor?

Also, the motor did have a 4v cast iron intake and the 4v heads that are marked

with a 4* (4 dot) in the corners. could this mean my original motor was replace with

a '72 351HO motor?

Thanks for the input!

Doug


Here are some pics of 351C that came in my M code Mach1

 

[barnett468]

They used the same number for 72 and 73 . The date on your engine is September 9 th 1972 which is for an early 1973 car and possibly has 4 bolt mains.

 

[Don C]

You'll need to check your head casting numbers to determine if the heads are from your original '71, and are closed chambers, or the open chambers from the later engine.

http://www.7173mustangs.com/thread-casting-numbers-and-engine-codes

 

[dhvidston]

They used the same number for 72 and 73 . The date on your engine is September 9 th 1972 which is for an early 1973 car and possibly has 4 bolt mains.

Thanks. with the oil pan off, I see that I have two bolt main.

You'll need to check your head casting numbers to determine if the heads are from your original '71, and are closed chambers, or the open chambers from the later engine.

Thanks Don.. would the "4 dot" number in the corners indicate open chambers?

Are there other numbers I need to look for?

 

[Stanglover]

Hi all.

Restoring a 1971 Mach1 "M" code.. or so I thought!

Was stripping the motor to repaint and found the casting numbers under the block.

D2AE-CA and 2 J 9... unfortunately, I thinks this must mean my original motor was replace with a 1972 motor?

Also, the motor did have a 4v cast iron intake and the 4v heads that are marked

with a 4* (4 dot) in the corners. could this mean my original motor was replace with

a '72 351HO motor?

Thanks for the input!

Doug


Here are some pics of 351C that came in my M code Mach1

To me, it looks like the block only was replaced. Your block date code is 1972 Sept. 09 and list as a Cobra Jet block, but I think your heads are '71 C.C. heads as they have the 4*. What is the date codes for the heads? Those can be found between the valve springs. With a mirror you could see the head casting numbers just under the intake ports, in reverse of course ( or pull the heads off). That should tell you more. You would be looking for something like D0AE-6090-GA or other letters. It could also be D1ZE-?? thought to be CJ heads. Also, there will be the sequential VIN number just under the left hand head stamped at the back of the block. You may also have a 4 bolt main!! Pull the pan, man.

If you have not found MustangTek.com , it is a good source of information.

Hope that helps.

Geoff

 

[dhvidston]

Hi all.

Restoring a 1971 Mach1 "M" code.. or so I thought!

Was stripping the motor to repaint and found the casting numbers under the block.

D2AE-CA and 2 J 9... unfortunately, I thinks this must mean my original motor was replace with a 1972 motor?

Also, the motor did have a 4v cast iron intake and the 4v heads that are marked

with a 4* (4 dot) in the corners. could this mean my original motor was replace with

a '72 351HO motor?

Thanks for the input!

Doug


Here are some pics of 351C that came in my M code Mach1

To me, it looks like the block only was replaced. Your block date code is 1972 Sept. 09 and list as a Cobra Jet block, but I think your heads are '71 C.C. heads as they have the 4*. What is the date codes for the heads? Those can be found between the valve springs. With a mirror you could see the head casting numbers just under the intake ports, in reverse of course ( or pull the heads off). That should tell you more. You would be looking for something like D0AE-6090-GA or other letters. It could also be D1ZE-?? thought to be CJ heads. Also, there will be the sequential VIN number just under the left hand head stamped at the back of the block. You may also have a 4 bolt main!! Pull the pan, man.

If you have not found MustangTek.com , it is a good source of information.

Hope that helps.

Geoff

Thanks Geoff... the head casting number looks like "0J26",,, two bolt mains

 

[Don C]

That's the date code, but it's good news, October 26, 1970, so they're closed chamber.

 

[barnett468]

the head casting number looks like "0J26",,, two bolt mains

those should be for early 1971 model made in late 70.

what is the casting number?

 

[dhvidston]

That's the date code, but it's good news, October 26, 1970, so they're closed chamber.

Thanks Don.. just want to clarify.. it seems the CC heads are more desirable with the higher compression... in which case, I hope I have them.. but I'm still a bit confused on the ID of the heads.. I know they are for 4v but I've read on line that the *4 (4 dot) indicates "open chamber".

I've attached a photo.

Also, would this be correct for an "M Code" motor?

What components make up an M code?

Here's what I know right now.. I have a 1972 351C block that is a D2AE-CA

which some say indicates a Cobra Jet block, with 2 bolt mains and *4 heads

 

[TommyK]

That's the date code, but it's good news, October 26, 1970, so they're closed chamber.

Thanks Don.. just want to clarify.. it seems the CC heads are more desirable with the higher compression... in which case, I hope I have them.. but I'm still a bit confused on the ID of the heads.. I know they are for 4v but I've read on line that the *4 (4 dot) indicates "open chamber".

I've attached a photo.

Also, would this be correct for an "M Code" motor?

What components make up an M code?

Here's what I know right now.. I have a 1972 351C block that is a D2AE-CA

which some say indicates a Cobra Jet block, with 2 bolt mains and *4 heads

There appears to be no correlation between dot/no dot and OC/CC.

http://www.351c.net/archive/parts/cleveland-parts-catalog/cylinder-heads/351c-4v-cylinder-head-date-codes/

 

[dhvidston]

That's the date code, but it's good news, October 26, 1970, so they're closed chamber.

Thanks Don.. just want to clarify.. it seems the CC heads are more desirable with the higher compression... in which case, I hope I have them.. but I'm still a bit confused on the ID of the heads.. I know they are for 4v but I've read on line that the *4 (4 dot) indicates "open chamber".

I've attached a photo.

Also, would this be correct for an "M Code" motor?

What components make up an M code?

Here's what I know right now.. I have a 1972 351C block that is a D2AE-CA

which some say indicates a Cobra Jet block, with 2 bolt mains and *4 heads

There appears to be no correlation between dot/no dot and OC/CC.

http://www.351c.net/archive/parts/cleveland-parts-catalog/cylinder-heads/351c-4v-cylinder-head-date-codes/

Great info! THANKS

 

[Don C]

M codes have 4V closed chamber heads and usually 2-bolt blocks.

You can find the actual casting number, which will verify the head you have, on the underside of one of the intake runners. A mirror is required while the heads are still on the block.

Yes, the closed chamber are more desirable, both for the higher compression and being a quench style head, which helps reduce pinging.

 

[dhvidston]

M codes have 4V closed chamber heads and usually 2-bolt blocks.

You can find the actual casting number, which will verify the head you have, on the underside of one of the intake runners. A mirror is required while the heads are still on the block.

Yes, the closed chamber are more desirable, both for the higher compression and being a quench style head, which helps reduce pinging.

Thanks Don

Attached are photos of the casting numbers...( i phones are great in tight places, upside down) reads D1AE - GA... your thoughts?

tnx

 

[barnett468]

Here's what I know right now.. I have a 1972 351C block that is a D2AE-CA

which some say indicates a Cobra Jet block, with 2 bolt mains and *4 heads

You have a 73 block.

They used the same number for 72 and 73 . The date on your engine is September 9 th 1972 which is for an early 1973 car and possibly has 4 bolt mains.

Attached are photos of the casting numbers...( i phones are great in tight places, upside down) reads D1AE - GA... your thoughts?

tnx

Definitely early 71 heads . If they are on the block, you can use a bore scope to try and see if they are open or closed chamber.

those should be for early 1971 model made in late 70.

what is the casting number?

 

[Don C]

They're closed chamber.

You can look them up here:

http://www.7173mustangs.com/thread-casting-numbers-and-engine-codes

 

[basstrix]

Based on the date code and casting #, I believe you have 66cc chambers on those heads.

Per George Pence