Like was mentioned. Get yourself a bore scope. Milwaukee makes a nice unit for like $200 I have one and it has come in very handy. For all you know the piece of tape is still in the timing cover area. Wishing you success.
https://www.milwaukeetool.com/2313-20
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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