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Forum: 61-66 Big Pontiac TECH 01-13-2014, 10:59 AM
Replies: 53
Views: 2,134
Posted By geeteeohguy
It could be a flat cam, bent pushrod, hole in...

It could be a flat cam, bent pushrod, hole in the piston, or, more likely, a burnt exhaust valve. Try a leakdown test to verify, after you check for a flat cam.
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