57 Harmonic Balancer Pulley - Joe Lucia

[Michael K.]

Can you please tell me if GM part# 3742991 for a harmonic balancer pulley will work on a 57 270hp.

I am unable to find the correct reconditioned balancer and pulley assembly that I need. I am thinking about using the #3584 (1957-61 All) Paragon balancer with the bolt on #991 pulley. Will this work? I am assuming the the only major difference with the balancer assembly's was the type of pulley that was attached to it?

Damper Doctor does not have one, and the place I sent mine out to for rebuilding, broke the outer ring. The good news in all of this is that I found out it wasn't the correct one for the car.

Does anyone have any other suggestions?

Thanks in advance.

[Gary G.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

Michael,

I know you are waiting for Joe to verify a correct application from a
numbers prespective.

From actual usage I can tell you that the Paragon part numbers you posted will work.

I had this exact setup on my '57 250 hp until the Damper Doctor could recondition my original riveted balancer assembly.

Original riveted assemblies show up on eBay every now and then.

Good luck!

Gary Geminn 20578

[Gary G.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

Mike,

Just a quick followup to my previous post.

I realized after posting, that your 270 hp engine could have been equipped with a bolt-on balancer pulley. So you would not necessarily be looking for a riveted assemnbly.

I still believe that the Paragon parts will work fine.

Gary Geminn (20578)

[Joe L.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

[quote=Michael Kostiuk (42473);282936]Can you please tell me if GM part# 3742991 for a harmonic balancer pulley will work on a 57 270hp.

I am unable to find the correct reconditioned balancer and pulley assembly that I need. I am thinking about using the #3584 (1957-61 All) Paragon balancer with the bolt on #991 pulley. Will this work? I am assuming the the only major difference with the balancer assembly's was the type of pulley that was attached to it?

Damper Doctor does not have one, and the place I sent mine out to for rebuilding, broke the outer ring. The good news in all of this is that I found out it wasn't the correct one for the car.

Does anyone have any other suggestions?

Mike-----


There is no doubt in my mind that the GM #3896904 balancer (Paragon #3584) and GM #3742991 pulley will work with your application. What I don't know, for sure, is if this set-up will also require a change in the waterpump pulley. However, I think that you'll be able to use your existing waterpump pulley.

[Roy B.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

If your's is a wibited on pulley I think I have a extra one , let me know, I "think" it's the same as 55 to 57 vett or car. Ask Joe

[Michael K.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

Roy, are you talking about just the pulley or the complete balancer and pulley assembly?

[Michael K.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

Joe, do you know if I am supposed to have a riveted or bolted on balancer? VIN #3029 Also, I notice in the catalogs that they say you need a 1/8" spacer between the crankshaft and balancer. Was this something that was originally on the engine, or do you have to put it in when installing a replacement balancer?

[Roy B.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

pulley is rivited to the balancer

[Joe L.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

Joe, do you know if I am supposed to have a riveted or bolted on balancer? VIN #3029 Also, I notice in the catalogs that they say you need a 1/8" spacer between the crankshaft and balancer. Was this something that was originally on the engine, or do you have to put it in when installing a replacement balancer?

Mike----


As Roy mentions, the original pulley was riveted to the balancer. That configuration is not important to FUNCTIONALITY, though; just originality.

All 1957-62 Corvettes used the balancer spacer.

[Roy B.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

Mike----


As Roy mentions, the original pulley was riveted to the balancer. That configuration is not important to FUNCTIONALITY, though; just originality.

All 1957-62 Corvettes used the balancer spacer.

55 and 56 too or am I not right?

[Joe L.]

Re: 57 Harmonic Balancer Pulley - Joe Lucia

55 and 56 too or am I not right?

Roy-----


Supposedly, it was used only for 1856 Corvettes with 2 X 4. I can't find any info that it was used for 1955, but it's possible it was.