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The timing mark on all 305 to 400 small block Chevrolet engines from 73 to 87 is on the hamonic balancer which is the pulley behind the crankshaft and has no belt grooves...smooth with a split line on it....that line is the timing mark.

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โˆ™ 2011-09-14 10:54:53
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Q: Where are the timing marks on an 1986 K-5 Blazer 305 ci?
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