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Old 08-15-2012, 08:02 AM
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Olds 425 harmonic balancer

Need some help; rebuilding the 385hp 425 in my '66 Starfire and I need a harmonic balancer. Do I have to find one specifically for a 425, or is there a generic GM big-block balancer that fits my engine? The compatibility charts on the ebay auctions don't give me much hope of a cross-match. Also, does anybody know where to go for a NOS balancer for the 425? The vintage Olds specialty parts stores will rebuild mine, but don't have any NOS. Thanks for helping!
Mike

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Old 08-15-2012, 09:46 AM
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I'm pretty sure(99%) I saved one from a 66 toronado (425) I do not know the condition of it (it was used).. I can look it over when I get home this evening. My email is ************ if you want to send me an email about it.

Last edited by 68NovaSS; 08-15-2012 at 11:44 AM. Reason: Email posting against Board guidelines and post is a classified for parts. Please use PM's or enable member contact feature.
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Old 08-15-2012, 10:07 AM
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Thanks, and watch for an email.......
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Old 08-15-2012, 12:29 PM
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I would avoid a NOS balancer....from 1966! Get a good aftermarket unit. The rubber elastomer will be brittle and cracked on a NOS. It will not be able dampen, will slip the inertia ring, and may fly apart hurting people or your car/engine. The balancer is no place to skimp.
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Old 08-15-2012, 12:53 PM
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I appreciate what you're saying, but the 1966 425 is odd in today's market and I can't find a balancer (period). I realize too that the balancer from a smaller engine of the same vintage might fit, but I can't find one of those to even compare parts numbers........ Even the vintage Oldsmobile sites will offer to rebuild ONLY 1961-64 balancers, and ebay has over 700 auctions for balancer's and I found just one for a '66 425 and that one was used. I contacted the Damper Doctor and they would rebuild mine (they have no core to rebuild) and I was trying to move a little faster than waiting for mine to get shipped (both ways) and rebuilt in the meantime...... I don't choose to scrimp but I seem to be running out of options.
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Old 08-15-2012, 01:08 PM
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Gotcha. In the middle of reading your post I was going to suggest damper Dr. They have a great rep and good prices. It is a good option, too bad its your only option. Did they give you a time est. On rebuilding your old one?
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Old 08-15-2012, 01:24 PM
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I appreciate your feedback on the Damper Doctor (I've never used them). If I hurry and get my old damper to them they may get 'er done before they close shop (they close in the month of Sept). Otherwise I gotta wait until October, and I wanted to be rippin' some rubber by then!!!!! I'm putting a mild Isky cam and valve train in along with a couple of other tweaks. The block has been zero-decked and it needed a re-bore so it'll be .040 over when I get it back. I'm hoping it'll push 400 hp and have a stronger torque curve, and I'm getting IMPATIENT. Maybe psycho is a better word........
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Old 08-15-2012, 01:57 PM
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We've had success with another company, in California. "The Damper Dudes". First-rate work.

A good balance shop can "match" a 455 Olds balancer to your 425.

FWIW

Jim
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Old 08-15-2012, 02:25 PM
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Good information Jim, thanks!!!!
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Old 08-16-2012, 11:43 AM
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I contacted Damper Dudes and they had exactly what I need. It was a fair price and it already shipped. Thanks for your help solving my problem!!!
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Old 08-16-2012, 12:38 PM
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No sweat! That's why I come here...

Jim
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