blu00rdstr

How do cam specs differ when going from LS1 heads to L92 heads and L76 intake?

gametech

iTrader: (1)

The intake to exhaust ratio is biased differently on l92 heads. This will affect cam specs. The l92's heavily favor intake flow out of the box.

Gannet

I should think other heads would be a better choice for FI, for just that reason. Ported LS6 heads kill L92s on the exhaust side, to say nothing of AFRs.

blu00rdstr

I also have a set of stage 2 ported LS1 A&A/WCCR heads.

Comparing the two at .600" lift:

Exhaust
Stage 2 LS1 3.905" bore . . . 222.6
Stock LS3 4.030" bore . . . . 214.6 ... -8cfm

Intake
Stage 2 LS1 3.905" bore . . . 291.8
Stock LS3 4.030" bore . . . . 328.7 ... +36.9

FWIW -The port surfaces of the LS3 heads are like 80 grit. I've smoothed the exhaust port surfaces with sanding rolls on a die grinder, but haven't touched the intake ports and I haven't changed the shape of the exhaust ports.