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post #1 of (permalink) Old 05-22-2006, 07:57 PM Thread Starter
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Harmonic balancer

I'm finding out that there are 3 sizes of harmonic balancers for chevys. it would appear that 8 inches are the most common. i'm putting together my new 30 over small block, and need a balancer. now, i know a few balancers came keyed two different ways. assuming my block is an 87 and up (which i think it is, i just got it 30 over from a shop) how do i know which harmonic balancer to use?
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post #2 of (permalink) Old 05-22-2006, 07:59 PM Thread Starter
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Re: Harmonic balancer

i should have said this too. the crank is also 87 and up. the block is a 4 bolt main, but i don't think that changes anything.
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post #3 of (permalink) Old 06-17-2006, 08:39 AM
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Re: Harmonic balancer

One thing I make sure of with SBC harmonic balancers is matching the timing indicators to Top Dead Center on both the timing cover and harmonic balancer. Usually the smaller diameter harmonic balancers will have the timing indicator welded to the timing cover, and the larger harmonic balancers will have the the timing indicator bolted to the timing cover. I don't think there is a difference between the harmonic balancers used on cranks with one piece rear main seals (87 and newer) and cranks with two piece rear main seals (86 and older). If I needed a SBC 87 or newer harmonic balancer, I'd pull what I needed from a SBC 87 or newer in a U-Pull It junk yard. I would pull the timing cover also to keep the harmonic balancer and timing cover as a matched set. Usually the 87 and newer GM pickups with a SBC 350 will have the larger diameter harmonic balancer? I have a 1991 Police 350 (one piece rear main seal crank) in my garage, and I did not see any difference (except timing indicators) in the harmonic balancer with my older SBC harmonic balancers.
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