You could also check your timng chain, If it is in bad condition, it may have slipped a tooth. It happened to an 81 truck I had once. It took me forever to find the problem.
$0.02
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Not Grandpa's C-20 anymore...
383 Stroker 425HP, 485Ft/Lbs
Lowered 3.5" Front / 5" Rear
66,000 miles.
Alberta, CANADA
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