So John did you find an answer? Do any have a GM number on them? The 350 is an internally balanced engine and came mostly with a 7" balancer, but some did come with an 8" one. Depends on the year of the engine and what it was originally installed in I guess. For the most part though they had a 7" balancer.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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