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Old 02-22-2014, 06:36 PM   #20
Dimitrim
Dimitri
 
Drives: 68 GTO 455 Ram Air; 2014 Camaro ZL1
Join Date: Jan 2014
Location: Novato, California
Posts: 602
Have No 5 leak down tested. It's possible you have a exhaust valve not seating correctly. While you are at it I would have a leak down test on all 8 cylinders from a non GM mechanic. It's good cheap insurance. Maybe 2 hours labor no parts.
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