Cylinder Head Casting Number
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Junior User
Joined: Jun 2010
Posts: 52
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From: Durham California
you'll never guess where that came from. I had a 1967 f100 with a 352 in it. My grandparents bought it new from the dealership. Doesn't seem like the heads that should be on the engine. Well this brings up compression ratio concerns for me. I am rebuilding the 352 into 390. So what compression am i looking with:
the heads listed above,
These pistons: Keith Black/KB Pistons 1131-STD - Keith Black Silv-O-Lite Cast Pistons - Overview - SummitRacing.com
A head gasket with a bore of 4.04'' and a compression thickness of .041''
Normal 390 bore of 4.05 and the normal 390 stroke.
My concern is that these heads will give a compression higher than the standard truck compression. Should be about 9.5-1 but with these abnormal heads will it be higher?
the heads listed above,
These pistons: Keith Black/KB Pistons 1131-STD - Keith Black Silv-O-Lite Cast Pistons - Overview - SummitRacing.com
A head gasket with a bore of 4.04'' and a compression thickness of .041''
Normal 390 bore of 4.05 and the normal 390 stroke.
My concern is that these heads will give a compression higher than the standard truck compression. Should be about 9.5-1 but with these abnormal heads will it be higher?
Tuned
Joined: Feb 2003
Posts: 392
Likes: 1
From: New Jersey
Stock the 67-68 S-code engine is listed as 10.5:1 on the compression. I have one in my 68 Mustang and it's been 20 years since I rebuilt it but I think the pistons were flat tops with small valve reliefs.
Thread Starter
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Junior User
Joined: Jun 2010
Posts: 52
Likes: 0
From: Durham California
I keep calculating my compression ratio and keep getting about 10.9 : 1. This seems really high to me. If someone could go over my data here and tell me what is wrong, if anything is. It is a FE 390 with C7AE-A heads.
bore: 4.05''
stroke: 3.78"
head gasket bore: 4.04''
head gasket comp. thickness: .041''
combustion chamber volume: 70cc
piston dome volume: 0 (because they arent dished or domed. I am using the ones shown above)
Deck Clearence: .01''
If any of this looks off let me know. Or will my engine really have 10.9:1 compression ! XD
bore: 4.05''
stroke: 3.78"
head gasket bore: 4.04''
head gasket comp. thickness: .041''
combustion chamber volume: 70cc
piston dome volume: 0 (because they arent dished or domed. I am using the ones shown above)
Deck Clearence: .01''
If any of this looks off let me know. Or will my engine really have 10.9:1 compression ! XD
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