what size heads?
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Senior User
Joined: Feb 2005
Posts: 432
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From: Pulaski, TN
what size heads?
i have got what was a 351w- i had it bored .30 over to a 356 and what i believe might be 400 heads, the reason i think that is because when i looked in my haynes maual for the tightning sequence for the intake, the 351w had a 16 bolt intake and mine is a 12 bolt, the intake listed under the 351m/400 is the same as mine, a 12 bolt, on the top of my block under my intake says 351 wcp and the intake is an edelrock 351-w performer, at least thats what it says on the top. so my question is what kind of heads do i have?
Elder User
Joined: Nov 2008
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From: houston
They must have mixed the pictures up when they printed the book.302/351w have 12.I looked at an old Haneys and its the same as yours.Boss 302 intakes have 16 because they fit on the Boss`s Cleveland style heads.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Your Haynes manual must be really old since the last 351w intake with 16 bolts was in 1974. It's anybody's guess what heads you have, there just isn't enough info in your post. And because I hate bowties I have to point out that 30 over on a 351 produces a 357.. ain't that cool. 
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Senior User
Joined: Feb 2005
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From: Pulaski, TN
thanks alot guys. the guys that bored my block said it would be a 356 but a 357 sounds better. the motor actually came out out of a 74 ltd, the haynes book i got is only a couple of years old but it seems it has too many misprints, i think i better go get another. im not sure what kind of heads it is but i sure know that motor sounds great. how do you figure out how to get the new block size after the bore?
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Then it's a good chance the heads are OEM Ford from the same era, if you can find casting numbers on them post it up, they would be on the head gasket surface, you'll need a mirror to see them if the heads are mounted.
Engine displacement is just algebra, area of the circle times stroke times # of cylinders. Online calculators like this one will do the math for you.. Engine Displacement Calculator
First select the Ford 351 and then enter 4.03 for the bore and press Calculate.
Engine displacement is just algebra, area of the circle times stroke times # of cylinders. Online calculators like this one will do the math for you.. Engine Displacement Calculator
First select the Ford 351 and then enter 4.03 for the bore and press Calculate.
Posting Guru
Joined: Sep 2004
Posts: 1,915
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From: Yokosuka, Honshu, Japan
IIRC, it's ((bore x (stroke x stroke)) x # of cylinders) x .785 for CID. That result x .016 for CC. (.785 is pi divided by 4) You can Google engine displacement calculators and find many online calculators that will do the math for you 
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Senior User
Joined: Feb 2005
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From: Pulaski, TN
thanks, i will try some online calculators. i pretty sure my heads are original 351 heads now, that haynes manual i got just threw me off, i have come across alot of misprints in it , i think i will stop using haynes, it isn't the first haynes manual i found with misprints. my all american and chilton seems to be correct. again, thanks for the help.
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