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Re: 72 Chevy k20 350 won't start
I looked at the one on my Blazer and it has 7 teeth with 0 (TDC) being the middle one. There is writing on the tabs - usually "before" and "after" and numbers like 2, 4, 6, etc. Clean it off real well and you will see them. Mark 0 with some chalk along with the timing mark on the crank balancer.
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1961 C1 Corvette
1959 El Camino 350 TPI, 9" 4 w disc
69 Blazer K5 - sold July '20
2021 Durango RT 5.7
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