Quote:
Originally Posted by Q-ship
You know that the LS3 and the L92 are basicly the same head when it comes to flow? The only difference in the GMPP catalog is that the LS3 has a slight advantage in the amount of lift it can take.
LS3 max lift (as machined from GM) is .570
L92 max lift (as machined from GM) is .510
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Of the hundred or so small block Chevy motors I built for myself and friends back in the day, I never found heads to be a limiting factor of valvespring lift. The limiting factor is the valvesprings having the ability to handle the lift and not bind (and valve to piston clearance - but the pistons are easily flycut). If you needed bigger springs to obtain proper seat pressure required by the camshaft, you merely had the spring seats machined.