1966 327 / 1969 327 Harmonic balancer exchangeable?

John
12/13/04

I have a 1966 chevy 327 sb small journal and I need a new harmonic balancer, the local parts store has one for a 1969 327 small block, they look totally different but the hole for the shaft is the same. Can I use the 69 harmonic balancer?

Mr. Bowtie

John, The 350 Horsepower 327 had a different harmonic balancer, than the lower horsepower 327's. The high horsepower 327's had a 8 inch diameter balancer, the the lower horsepower 327's had a 7 inch diameter balancer.

The 1966 327 had a 2.30 inch main journal, The 1969 327 had a 2.45 inch main journal.

The 1969 crankshaft had bigger rod and main journals, which means the harmonic balancer was bigger in 1969 to balance more weight, compared to the 1966 balancer.

caak66@yahoo.com
4 months ago

what is the correct GM part # for the harmonic balancer for a 327/300hp 1966 corvette?

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