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Old 08-21-2002, 06:38 PM
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Post SBC Harmonic Balancer

Ive just about got my motor together but it seems that the 2 balancers I have are bad so I'm gonna have to find another one. My question is...is there a difference in the older (pre 80's) balancers and the newer ones. I know the SBC's changed a little around 85 or 86 so I want to make sure I get the right one. Thanks, S10

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Old 08-21-2002, 08:39 PM
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What size motor do you have? A 350 will use a different size balancer than a 307, and be sure not to use a 400 balancer on a 350 or vice a versa. The 400 has a counterweight because it is externally balanced.
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Old 08-22-2002, 08:22 AM
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i think they're all the same (but come in different sizes-getta 8") just don't getta 400 one. dont get one from summit either.
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Old 08-23-2002, 05:28 PM
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I was in a hurry when I posted this and didnt realize that I didnt put the size of my motor...its a 350. I know not to try and put a 400 balancer on it. I was referring more to the older 350's and newer 350's. I talked to a friend who has a little knowledge in this area and he told me he thought the only thing Chevy changed on their motors was the rear main seal and that the balancers havent changed. Thanks for the reply's though.

Hey bullheimer, whats wrong with the Summit balancers...is there a bad experiance I might need to know about?
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Old 08-23-2002, 09:43 PM
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The newer one peice main seal blocks use a different flexplate (or flywheel). Because of the one peice main seal crankshaft design, the rear crank counterweight was eliminated, therefore a different flexplate with a counterweight is used. this flexplate may look simular to a 400 flexplate but they are not the same. The front balancer for the 350 is standard, however chevy made numerous different designs of balancers. Make sure the you have the right one. The timing mark tabs and TDC (top dead center) mark on the balancer may be in different locations (Top of timing cover or side) depending on year of production. P.S. Always have a rebuilt engine professionally balanced.
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Old 08-26-2002, 08:18 AM
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the outside of summits dampers' snout was so rough it would have eaten up the rubber seal in 10 minutes, had to get it smoothed at a machine shop, it also didn't line up with my pulleys and i had to have the machine shop take like an eighth of an inch off the end. suckee. had it on and off a bunch of times before i realized it was too long. motors running fine despite pounding in on 10 tens with a huge block! stripped my bolt threads tho. get one elsewhere, 8 inch. better yet getta fluid-dampner
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