Harmonic Balancer Part Number

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Sep 7, 2007 | 05:01 PM

jakers

Thread Starter

Melting Slicks

Joined: Feb 2005

Posts: 3,204

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From: Midland Georgia

St. Jude Donor '06

Harmonic Balancer Part Number

Long story short, I put a LT1 block into my vette from a F-Body. It is a two bolt main. My serpentine belt does not line up correctly. In doing my homework I have found that the balancer hubs are the same part in both cars, GM part #12553250, but the balancers are different. I am guessing that the reason that things are not lining up is because I may have a Balancer off of a F-Body aka Camaro which is GM Part #12551138. The Y-Body aka Corvette part number is GM #10128489.

Two basic questions:

Last edited by jakers; Sep 7, 2007 at 05:07 PM.

Sep 7, 2007 | 06:03 PM

ninetyfivevette

Burning Brakes

Joined: Jan 2002

Posts: 1,228

Likes: 1

From: Dallas Texas

I've got my old unit sitting in the garage- I'll check for you when I get home from work tonight. I can post a picture with dimensions as well if someone doesn't beat me to it.

Sep 7, 2007 | 07:54 PM

jakers

Thread Starter

Melting Slicks

Joined: Feb 2005

Posts: 3,204

Likes: 4

From: Midland Georgia

St. Jude Donor '06

Quote:

Originally Posted by ninetyfivevette

I've got my old unit sitting in the garage- I'll check for you when I get home from work tonight. I can post a picture with dimensions as well if someone doesn't beat me to it.

I really, really appreciate it!!!

This does not seem to be a much of a problem with anyone but me right now!? I am guessing as these cars age a few more people will resort to using two bolts main blocks and few components will get swapped around like on my poor car. Seeking out this info may help someone else in the future. Looking forward to the measurements and the pictures!

Sep 8, 2007 | 10:47 AM

jakers

Thread Starter

Melting Slicks

Joined: Feb 2005

Posts: 3,204

Likes: 4

From: Midland Georgia

St. Jude Donor '06

Sep 10, 2007 | 12:13 PM

jakers

Thread Starter

Melting Slicks

Joined: Feb 2005

Posts: 3,204

Likes: 4

From: Midland Georgia

St. Jude Donor '06

Anyone know this?

Anyone know this info? Pictures?

Last edited by jakers; Sep 10, 2007 at 02:00 PM.

Sep 10, 2007 | 03:32 PM

JAKE

Le Mans Master

Joined: Feb 2000

Posts: 9,715

Likes: 27

From: Kempner Texas

I didn't remove the balancer on my 96 LT1 when I pulled it to install the new 388 engine. I just bought a new ATI SuperDampr, so I don't know if there's a part number stamped on the stock one.

Someone can tell you for sure, but I believe it't length of the hub that differs between the 'F' and 'Y' body setups.

Jake

Sep 10, 2007 | 07:23 PM

jakers

Thread Starter

Melting Slicks

Joined: Feb 2005

Posts: 3,204

Likes: 4

From: Midland Georgia

St. Jude Donor '06

Quote:

Originally Posted by JAKE

Thanks for trying to help, but if the local Chevrolet dealer is correct the part numbers above tells a different story. Wish I could find someone that has both and could take a photo for me. That probably will not happen but I will keep my fingers crossed.

Sep 10, 2007 | 10:01 PM

jakers

Thread Starter

Melting Slicks

Joined: Feb 2005

Posts: 3,204

Likes: 4

From: Midland Georgia

St. Jude Donor '06

Doing some Homework

OK, I found the listings for the two Harmonic Balancers on the Rock Auto Web site. In comparing things I have learned that I have the correct balancer... but it is still too far forward.

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Sep 11, 2007 | 01:55 PM

JAKE

Le Mans Master

Joined: Feb 2000

Posts: 9,715

Likes: 27

From: Kempner Texas

Quote:

Originally Posted by jakers

OK, I found the listings for the two Harmonic Balancers on the Rock Auto Web site. In comparing things I have learned that I have the correct balancer... but it is still too far forward.

I thought it was the hub, so that's for straightening me out on that.

If yours is the correct one for a Vette, and it still extends too far forward, somthing's still amiss.

What measurement are you getting from the block to the first belt groove? I measured my stock LT1 setup a week or so ago and posted what I found.

Jake

Jan 27, 2008 | 04:39 PM

#10

Iskenderian

Instructor

Joined: May 2004

Posts: 187

Likes: 0

From: Fort Drum New York

Anyone know if the balancer hub from an Impala SS LT1 is the same? I have the correct balancer but it came without a hub. Second problem, if the hub is the same, anyone know any tricks for seperating an LT1 balancer hub from the balancer itself? i removed the three bolts and its not budgin' thanks

Bob