Swaping my 351 cleveland for 408w stroker

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40 over is too much. I will go with as little over as your cylinder allows. The big difference in cubic inches is made by the crank stroke. Not so much by the cylinder diameter.

Edit: sorry i posted this without reading the last posts so please ignore.

Sent from my SAMSUNG-SM-G930A using Tapatalk

 
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This appears to be the same 408 kit, balanced, includes flexplate and harmonic balancer. Couldn't tell much from the eBay description. It has 15cc dished pistons, which are necessary if you use closed chamber heads.

https://www.summitracing.com/parts/sca-1-94272be/overview/make/ford
Thanks Don. I got this kit and compression works out to about 10cr.

I do have another question.

So I bought speedmaster heads and ordeed ferrea 5000 valves however Intake valves overall length of ferrea valves is 0.44 shorter then speedmaster valves it is replacing

I am also replacing springs with trickflow springs . I'll be using scorpions roller rockers.

Basically , I will not be keeping any speedmaster components that came with the heads

My question is can i use these ferrea 5000 valves with different overall length? Is geometry going to be ok.?

I think, as long as I order custom pushrod I should be fine.

Thanks

Alex

 
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the sonic test info is useful but if you don't go .040", it won't help you any at the moment.

i also wouldn't line bore it unless it needs it.

.
He can do sonic testing and if it is ok we will bore cylinders to 040.

I wanted to stay at 030 originally and he said that it would cleanup however he prefers to go to 040... Anyways, I just have to wait until next week for him to tell me to order either 040 or 030 kit. I'll ask more about sonic test results and will consult with you here before making the decision.

I did some CR math here and these pistons that come with this summit kit are +3 CC . With 64cc heads and 0.040 gasket it will bring compression to 11.8

Way too much

I also found these kits online:

FORD 351(2.75")-393 SCAT STROKER KIT Premium Forged(Flat)Pist., I-Beam Rods

https://www.ebay.ca/itm/FORD-351-2-75-393-SCAT-STROKER-KIT-Premium-Forged-Flat-Pist-I-Beam-Rods/252417282217?hash=item3ac53e10a9:g:LWkAAOSwpLNX7srw:rk:10:pf:0&vxp=mtr

and this one

FORD 351(2.75")-408 SCAT STROKER KIT Forged(Dish)Pist., I-Beam Rods

https://www.ebay.ca/itm/FORD-351-2-75-408-SCAT-STROKER-KIT-Forged-Dish-Pist-I-Beam-Rods/331875910062?hash=item4d455881ae:g:hV0AAOSwzaJX7sqj:rk:25:pf:0&vxp=mtr

Could you give me your opinion? What CR should I aim for to stay on the premium pump gas?

Cheers

Alex
what is the elevation where you will be using it?

in your case, if you are within around 2000 feet of sea level, i would stick to around 9.5with aluminum heads, but it depends a little on which cam you use because the dynamic compression is the more important factor, not the static/uncorrected compression. i would also deck the block so the pistons are .002" to .003" below the deck. this will give you a little extra material in case you ever need to resurface it. i would then use .035" thick Cometic head gaskets.
I arm at around 200 feet of sea level. I bought the kit don suggested so I think I should be around 10 cr. Thanks for your help

 
Hi guys

Would comp 270h be good cam with my 3.25 gears and 408 stroker? Or lunati 62503 with higher stall converter  is better fit.

The only concern I have is the lift... it seems little small at 519

32-224-4

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=842&sb=2

I am only left to buy cam and then it's off to the engine shop

Cheers

Alex
What heads and compression did you decide on. I would not use the 270H cam.
Speedmaster 64cc heads... it will be 10.1 compression ratio. I want to stay with hydraulic ft lifters and cam

Thanks

Alex

 
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Hi guys

Would comp 270h be good cam with my 3.25 gears and 408 stroker? Or lunati 62503 with higher stall converter  is better fit.

The only concern I have is the lift... it seems little small at 519

32-224-4

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=842&sb=2

I am only left to buy cam and then it's off to the engine shop

Cheers

Alex
What heads and compression did you decide on. I would not use the 270H cam.
Speedmaster 64cc heads... it will be 10.1 compression ratio. I want to stay with hydraulic ft lifters and cam

Thanks

Alex
Are you using a Cleveland or windsor?

 
Try to take advantage of an asymmetrical cam profile where the exhaust is longer and/or higher lift.

Sent from my SAMSUNG-SM-G930A using Tapatalk
Would you have an example of the camshaft that would work in my case? 

i think i'll probably go with Lunati 62502 cam to be on the safe side.

Hydraulic Flat Tappet. Excellent torque for 351C with 4 bbl heads on daily driven street performance vehicle. Good torque and HP production with heavier emphasis on the lower mid through upper RPM ranges. Use 3.55 rear gears. Choppy idle.

Advertised Duration (Int/Exh): 262/268

Duration @ .050 (Int/Exh): 262/268

Gross Valve Lift (Int/Exh): .540/.552

LSA/ICL: 112/108

Valve Lash (Int/Exh): Hyd/Hyd

RPM Range: 1800-5800

Includes: Cam Only

Part Number: 10320702

Previous Part Number: 62502

Thanks

Alex

 
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Did you check the dynamic compression ratio with that cam? That is what will determine whether or not you will have any pinging problems with pump gas.

 
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Did you check the dynamic compression ratio with that cam? That is what will determine whether or not you will have any pinging problems with pump gas.
Thanks for the reminder Don. This is the result i got FOR VOODOO 62502:

Static compression ratio of 10.1:1.

Effective stroke is 3.71 inches.

Your dynamic compression ratio is 9.44:1 .

Your dynamic cranking pressure is 201.61 PSI.

Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 9.40 :1.

V/P (Volume to Pressure Index) is 229

Is that too much? What Dynamic ratio should I aim for?

COMP 270H WOULD GIVE ME :

Static compression ratio of 10.1:1.

Effective stroke is 3.23 inches.

Your dynamic compression ratio is 8.35:1 .

Your dynamic cranking pressure is 171.87 PSI.

Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.31 :1.

V/P (Volume to Pressure Index) is 170

Dynamic CR looks little better than previous cam.

There is also XE262H from comp

Hydraulic-Strong torque, excellent response. Good mid-range, stock converter, 3.23 gears.

Static compression ratio of 10.1:1.

Effective stroke is 3.33 inches.

Your dynamic compression ratio is 8.58:1 .

Your dynamic cranking pressure is 178.08 PSI.

Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.54 :1.

V/P (Volume to Pressure Index) is 182

Alex

 
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Cleveland or windsor?
Hi Barnett,

I replied back to you on the page 5...

Its 408 cleveland.

cheers

Alex
sorry, i missed it.

i would consider this cam which i think is one of the ones you mentioned, plus at least a 2000 rpm stall converter. I also only use crane anti pump lifters for flat tappet hydraulic apps but have heard the crower cool face cam oil lifters are also decent. you will need good push rods . the thick wall howards rods are a good deal.

http://www.lunatipower.com/Product.aspx?id=1623&gid=287
 
Hi Barnett,

I replied back to you on the page 5...

Its 408 cleveland.

cheers

Alex
sorry, i missed it.

i would consider this cam which i think is one of the ones you mentioned, plus at least a 2000 rpm stall converter. I also only use crane anti pump lifters for flat tappet hydraulic apps but have heard the crower cool face cam oil lifters are also decent. you will need good push rods . the thick wall howards rods are a good deal.

http://www.lunatipower.com/Product.aspx?id=1623&gid=287
Great. Thanks. 

That cam is giving me dynamic cr over 9.5. That is not good for pump gas . Don mentioned that I should be under 8.7

What do you think?

Alex

 
sorry, i missed it.

i would consider this cam which i think is one of the ones you mentioned, plus at least a 2000 rpm stall converter. I also only use crane anti pump lifters for flat tappet hydraulic apps but have heard the crower cool face cam oil lifters are also decent. you will need good push rods . the thick wall howards rods are a good deal.

http://www.lunatipower.com/Product.aspx?id=1623&gid=287
Great. Thanks. 

That cam is giving me dynamic cr over 9.5. That is not good for pump gas . Don mentioned that I should be under 8.7

What do you think?

Alex
You can safely run that cam with around 9.3 static compression with aluminumum heads. You may need to buy custom pistons to get the correct compression. I get them from race tech in california.

I would also use 1.8 ratio rocker arms with that cam. Below are 2 options.

https://www.summitracing.com/parts/csp-s40058/overview/make/ford

https://www.summitracing.com/parts/cca-1838-16/overview/make/ford

 
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Great. Thanks. 

That cam is giving me dynamic cr over 9.5. That is not good for pump gas . Don mentioned that I should be under 8.7

What do you think?

Alex
You can safely run that cam with around 9.3 static compression with aluminumum heads. You may need to buy custom pistons to get the correct compression. I get them from race tech in california.

I would also use 1.8 ratio rocker arms with that cam. Below are 2 options.

https://www.summitracing.com/parts/csp-s40058/overview/make/ford

https://www.summitracing.com/parts/cca-1838-16/overview/make/ford
Out of curiosity, do you know how much longer are the 1.8 rockers? I guess that if I knew the short arm I should be able to calculate the long arm.

 
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