[Notchkid89]

What would be a better comp raito for a street driven 86notch 351w s475 turbo 10psi c6 trans and 3:31 rear gear? Runs on Pump gas (but have considered e85)
With a normal size head gasket it will be around 9.4:1 with Dss racing dished pistons if that's a little high what size head gasket should I run to lower it to around 9.1-9.2:1?

 

[BOOSTED-SS-ELKY]

9.0:1

 

[Notchkid89]

I could get to about 8.8:1 if I used a reversed dome Probe piston but I as trying to keep standard bore they only start at .30 over

 

[Notchkid89]

I did my math wrong, it will be at 9:1 thanks guys

 

[Collinsautomotive]

you'll be fine anywhere from 9-9.5:1 on pump gas as long as you don't try to make heroci amounts of HP and use the right plugs and do some good chamber and piston prep.

 

[Notchkid89]

Collision.
I'm not looking to make over 600hp I'm just trying to see the better comp raito for a street car
9:1 with trick flow 190 heads or
9.2-9.4:1 with victor jr heads And only 10psi at best