![]() ![]() If you have flat top pistons & 76 cc heads with Fel Pro gaskets (.038 thick) or the equivalent it will be just creeping into the 9.25-9.5:1 compression ratio so a big cam will kill your low speed power. The TRW P/N for the Z-28 springs used to be VS1008, there are a ton of equivalent springs that work very well. ![]() Install hardened locks and you can use the stock chevy retainers (NO ROTATORS) which work work great & stand up up to higher spring pressure. ![]() Do not get caught up in getting the most lift you can. ![]() Be sure to keep the intake duration in the 220 degree or less range, you can go 225 or so on the exhaust which will actually help fill the cylinder for the intake cycle.
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