Going to flat top pistons?

[1973mach1]

IM going to be pulling my 351c 2v soon, its a 72' engine I was wondering if adding flat top pistons 9.1 to 1 compression would make much difference over the dished pistons they used in 72' and 73', 8.6 to 1 compression I think they had? How much compression do I want for an street engine like this?

Thanks,
Jim

 

[C.Harris]

I have no problem running 10:1 compression on the street with pump gas (93) with my '71

 

[Fostang]

I say at least 10.5 and some hardned valve seats. Make it worth your while.

My buddy will be running 11.5 on pump gas on his Chebby.

 

[jcp123]

that depends on some stuff: the octane of your local premium, how big a cam you have (since a big one can sometimes effectively lower your static compression)...off the top of my head i'd say 10:1

 

[Route666]

I'd say 10.5

 

['69Stang]

If you have the 2v heads the flat top pistons (+2 to 4cc’s) should net you just around 10:1, and that should be fine. If you want more compression you will have to mill the heads (and intake manifold). If you have 10.5:1+ compression I’d run a minimum of 92 octane.

If you had quench heads you could run more, but I’d stick to 10.5:1 or less with those heads.