Also realize that installed spring heights open and closed pressures are somewhat cam specific. too high of a valve lift with too short a spring with high seat pressure will wipe out a lobe.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.