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11:1 ford 302 compression

23360 Views 13 Replies 5 Participants Last post by  1968poney
i have a tread about what octane i should use but heres a kicker the whole engine is a stock 1980 block with 1966 289 heads will the compression affect the internals of the engine like the rods crank bearings or pistons heres a list of exact whats in the 302

Stock cam
Stock flat toped pistons with valve reliefs
Stock rods
Stock crank

Engine bore is .030 over
Mains are .010 over
Cam is .010 over

The heads have a chamber of 54.5cc

a bonus the stock 250 289 302 starter doesnt have enough power to get it turning to start but i got it too sounds great but only had it running for a couple of secounds and turned it off. is there any strenght concerns regarding the fact every thing is a stock 1980 302 i believe i dont know if for sure it is fully stock but would it be fine with 11:1 if it is all stock?

Thanks Tom
1 - 3 of 14 Posts
Hey with you combo your not running 11 to 1 compression more like 10 to 1.
Here is your average flat top piston and these compression ratios are with .030 over bore yours would be a little less. Sealed Power L2488F30 - Speed-Pro Powerforged Ford Pistons - JEGS
Check all of your wiring my 302 would always give me trouble. I just completed a 351w windsor conversion with a little more compression than yours and replaced all of the cables checked all the grounds and it turns over with no problems .
1 - 3 of 14 Posts
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