Compression ratio / head cc
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FTE Chapter Leader
Joined: Sep 2000
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From: Beachville, Ontario
Compression ratio / head cc
Does anyone know the combustion chamber cc of an E7TE-PA truck head and what compression ratio it gives on a 351? I have 2 sets of these heads, 1 from a 302 and 1 from a 351 and the only difference is in the bolt hole sizes.
1979 F150 Custom: nothing under the hood at all (again)
1987 F150 XLT Lariat: 88 351W EFI
75 351W: soon to have 91 heads, ?? cam, double roller timing chain, Edelbrock Performer intake & Holley carb and be put back in 79 F150
84 351W: waiting for ???
Chevy 454: waiting for a truck (Mazda?Nissan?)
1979 F150 Custom: nothing under the hood at all (again)
1987 F150 XLT Lariat: 88 351W EFI
75 351W: soon to have 91 heads, ?? cam, double roller timing chain, Edelbrock Performer intake & Holley carb and be put back in 79 F150
84 351W: waiting for ???
Chevy 454: waiting for a truck (Mazda?Nissan?)
Senior User
Joined: Oct 2000
Posts: 227
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From: arkansas
Compression ratio / head cc
they are 69cc chambers, but do not know what compression they will give, due to the different pistons. I think in a 302, flat top 4 valve reliefs, they're probably around 8.8-9.2, in a 351 with a dish-top piston, they're probably about the same, but again I'm not sure about those
Thread Starter
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FTE Chapter Leader
Joined: Sep 2000
Posts: 3,862
Likes: 5
From: Beachville, Ontario
Compression ratio / head cc
Thanks, I'll have to see what type of pistons are in the 75 block to guess my compression ratio. Since the chambers are the same size between EFI 302 and EFI 351 I guess the 351 would have dished pistons to maintain a 9.0:1 compression ratio. I'll have to pull a plug on my 87 and take a peek in there.
1979 F150 Custom: nothing under the hood at all (again)
1987 F150 XLT Lariat: 88 351W EFI
75 351W: soon to have 91 heads, ?? cam, double roller timing chain, Edelbrock Performer intake & Holley carb and be put back in 79 F150
84 351W: waiting for ???
Chevy 454: waiting for a truck (Mazda?Nissan?)
1979 F150 Custom: nothing under the hood at all (again)
1987 F150 XLT Lariat: 88 351W EFI
75 351W: soon to have 91 heads, ?? cam, double roller timing chain, Edelbrock Performer intake & Holley carb and be put back in 79 F150
84 351W: waiting for ???
Chevy 454: waiting for a truck (Mazda?Nissan?)
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