Also check for a bent pushrod, bad lifter combination of both. You could also, instead of the forementioned BS rhetoric I stated, A wrist pin knock or a bad valvespring allowing the valve to impact the piston top.
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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.
