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is it common for a 78 to not have any timing marks on the balancer or indicator on the block? every small block i had, had a mark and a indicator.
There are a couple of common reasons that you aren't seeing a mark
1. The outer ring of the balancer has slipped, so the line is to far off to see with a timing light.
2. Some one installed a balancer from a different year Chevy that had the pointer on the other side, so the mark won't match the timing pointer on your Corvette.