Originally posted by S19243H
i had the same problem on a 305 found out the cam had way to much lift wha cam are you using?
Voodoo Camshafts
Camshaft & Lifter Kit
Lift: .489''/.504''
Duration: 268°/276°

If this is the problem, what needs to be done to the cylinder heads. Not trying to spend a hole lot of money.