Valve spring pressure

[randy wilson]

it doesn't make sense. only one of three things could cause this. first, put a .030 shim under each spring and see if the extra pressure picks up rpm, second, check timing, i know it sounds simple, but double check it, third, check cam intake centerline. your car should be turning tighter not less as you know. my bet is that you don't have the spring pressure you had earlier for what ever reason.