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1FAST68 · 12-09-2009, 10:50 AM

I never hurt anything and the boost was 10lbs I think. Those Trw dished pistons are tough. The cr was in the 8's.

You can use 9:1 as Wild83 suggested, but I don't know if pump gas will work at 10lbs or above.

If you have E85 in your area you can go higher on the cr and boost but then you get into more expensive fuel system and carb.

12-09-2009, 10:50 AM	#16
1FAST68 Registered User Join Date: Apr 2008 Location: east, tx Posts: 149	Re: Building sbc for boost I never hurt anything and the boost was 10lbs I think. Those Trw dished pistons are tough. The cr was in the 8's. You can use 9:1 as Wild83 suggested, but I don't know if pump gas will work at 10lbs or above. If you have E85 in your area you can go higher on the cr and boost but then you get into more expensive fuel system and carb. __________________ 68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress