compression ratio 74 302
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From: south louisiana
I recall the big drop coming in the 72 model year, for just about all Ford V8's. I do know that Ford added a Grand Canyon sized dish to the 72 302 pistons that year. In 78, they went back to flat tops and enlarged the combustion chambers in the D8OE heads. Combine those two by mistake, and you've got a blower ready motor.
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From: south louisiana
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Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Yeah, those nasty 69cc heads...those are what I was thinking of.
Digging out my Motor's manual, I see that we had 8.0:1 across the board for almost every Ford passenger car engine from '73 to '76 (It doesn't show trucks, and I don't have any truck manuals for those years)
I stand corrected...or rejected, or dejected or whatever...
Digging out my Motor's manual, I see that we had 8.0:1 across the board for almost every Ford passenger car engine from '73 to '76 (It doesn't show trucks, and I don't have any truck manuals for those years)
I stand corrected...or rejected, or dejected or whatever...
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Junior User
Joined: Sep 2004
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well i was thinking 8-1 or 8.5-1 myself i have a old 68 302 with alot smaller dishes than the 74 which would conclude that it was higher compression and didn'T have anyemission crap on it like the 74. well this helps alot guys thanks
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Joined: May 2003
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From: south louisiana
Originally Posted by TigerDan
Yeah, those nasty 69cc heads...those are what I was thinking of.
Digging out my Motor's manual, I see that we had 8.0:1 across the board for almost every Ford passenger car engine from '73 to '76 (It doesn't show trucks, and I don't have any truck manuals for those years)
I stand corrected...or rejected, or dejected or whatever...
Digging out my Motor's manual, I see that we had 8.0:1 across the board for almost every Ford passenger car engine from '73 to '76 (It doesn't show trucks, and I don't have any truck manuals for those years)
I stand corrected...or rejected, or dejected or whatever...
We've got a speed shop here in town, run by a Chevy guy. Back in the early 80's he built a 302 for a Ford guy that wanted to convert a 67 F100 from a 352/360 ( don't recall which it was) to the small block. The guy brought him a 78-up 302 to build. I showed up one day after he finished the shortblock. I also noticed the D8OE heads next to it............... I asked him where the blower intake was................ 
Because in the block were a new set of 72-77 dished pistons............ 
Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Ummm...oops! 
When I was in high school I had a '65 Olds Cutlass. It had really low compression, about 60 psi. When I tore it apart I found every top compression ring broken. I would imagine that 302 would have had compression about like that!
When I was in high school I had a '65 Olds Cutlass. It had really low compression, about 60 psi. When I tore it apart I found every top compression ring broken. I would imagine that 302 would have had compression about like that!
Mountain Pass
Joined: May 2003
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From: Milwaukee USA
Just because I'm in the same boat. I have a 73 F100 longbed with a 302. The 302 block in 73-76 trucks, aside from having dished pistons actually had lower than 8:1 compression due to deck height of 8.229 verses the standard 8.206 in cars. When I ripped my block apart, the pistons were easily 1/4 inch in the hold and dished. I milled of .023 to bring it back and cranked up some new KB pistons to bring it back up to a respectable 9.8:1, throwing in a .500 lift Comp Cam, some 1.9/1.6 values, port job and you have 300 ponies on tap.
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Joined: May 2003
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From: south louisiana
Originally Posted by old75F-100
well i guess my heads are c9ae c which are 58cc so my compression would be a bit higher i have a 68 block would that be a better choice because of the deck height for compression?