79 Harmonic Balancer

[Edward M.]

I finally got around to working on the 79. I need a harmonic balancer, since the original came off is two pieces. Yeah it was shot. Anybody know what the correct GM part number for this thing is. Engine is a base motor automatic.

[Joe L.]

Re: 79 Harmonic Balancer

I finally got around to working on the 79. I need a harmonic balancer, since the original came off is two pieces. Yeah it was shot. Anybody know what the correct GM part number for this thing is. Engine is a base motor automatic.

Ed-----


It was originally GM #6272221, later GM #10066045, and currently GM #12551537. The latter is about 160 bucks, GM list.

These are also available in the aftermarket. Balkamp (NAPA) #6005214 or Dorman #594012. Either of these sell for about 50 bucks. Are they the same as the GM piece? They APPEAR the same but that does not mean they ARE the same.

[Edward M.]

Re: 79 Harmonic Balancer

Thanks Joe.

Here is what I took off. I could fix this with some glue and duct tape.

[Edward M.]

Re: 79 Harmonic Balancer

Joe;

What can you tell me about balancer 3947701?

[Joe L.]

Re: 79 Harmonic Balancer

Joe;

What can you tell me about balancer 3947701?

Edward-----


GM #3947701 was a predecessor part number to the GM #6272221. It was used for many base 350 CID engines from 1969 through 1971. However, it was never originally used on any Corvette since 69-71 Corvettes with base engines used an 8" balancer. It was discontinued from SERVICE in May, 1972 and replaced by the GM #6272221. As far as I know, the GM #6272221 was also used in PRODUCTION for 72-82 Corvettes with L-48, LG-4, L-81, or L-83.

If one had a known GM #3947701 I'm very confident that it could be used to replace a GM #6272221 on any 72-82 Corvette originally using the 6272221.

[Edward M.]

Re: 79 Harmonic Balancer

Edward-----


GM #3947701 was a predecessor part number to the GM #6272221. It was used for many base 350 CID engines from 1969 through 1971. However, it was never originally used on any Corvette since 69-71 Corvettes with base engines used an 8" balancer. It was discontinued from SERVICE in May, 1972 and replaced by the GM #6272221. As far as I know, the GM #6272221 was also used in PRODUCTION for 72-82 Corvettes with L-48, LG-4, L-81, or L-83.

If one had a known GM #3947701 I'm very confident that it could be used to replace a GM #6272221 on any 72-82 Corvette originally using the 6272221.

10-4, and thanks. I just bought a NOS 3947701 off of Ebay. Cheaper than the aftermarket balancers.

[Steven B.]

Re: 79 Harmonic Balancer

A few years ago I read that someone rebuilds them. Does it work? who does it?

Thanks!

[John H.]

Re: 79 Harmonic Balancer

A few years ago I read that someone rebuilds them. Does it work? who does it?

Thanks!

Steve -

"Damper Dudes" and "Damper Doctor"; both are in Redding, California.

[Steven B.]

Re: 79 Harmonic Balancer

Steve -

"Damper Dudes" and "Damper Doctor"; both are in Redding, California.

Thanks John! I appreciate the info.

Steve