LT1 Differences -- Harmonic Balancers
Thread Starter
Melting Slicks
Joined: Jan 2002
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From: Jackson MI
LT1 Differences -- Harmonic Balancers
Are there any differences between the Harmonic balancer of a corvette LT1 and a Buick Roadmaster LT1? I know the pullies are different but I need to know about the hubs.
I'm asking because I blew up the vette engine and I'm replacing it with a roadmaster engine. I did a heads and cam swap on to it and I'm putting it back in. I put the vette crank pulley back on and its way off of allignment. I need to know if I just didn't tighten it down enough or the hubs are actaully a different sizes. Thanks.
I'm asking because I blew up the vette engine and I'm replacing it with a roadmaster engine. I did a heads and cam swap on to it and I'm putting it back in. I put the vette crank pulley back on and its way off of allignment. I need to know if I just didn't tighten it down enough or the hubs are actaully a different sizes. Thanks.
Safety Car
Joined: Dec 2002
Posts: 3,655
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From: Charleston SC
Yes,
The impala and buick use a 4'' hub while the Corvette and F-body use a 3 5/16'' hub (Not positive on the 5/16 but it is somthing like that). I know because I have an extra 4'' hub that was usless and I had to get a new one for my new motor.
The impala and buick use a 4'' hub while the Corvette and F-body use a 3 5/16'' hub (Not positive on the 5/16 but it is somthing like that). I know because I have an extra 4'' hub that was usless and I had to get a new one for my new motor.
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Originally Posted by FD2BLK
Yes,
The impala and buick use a 4'' hub while the Corvette and F-body use a 3 5/16'' hub (Not positive on the 5/16 but it is somthing like that). I know because I have an extra 4'' hub that was usless and I had to get a new one for my new motor.
The impala and buick use a 4'' hub while the Corvette and F-body use a 3 5/16'' hub (Not positive on the 5/16 but it is somthing like that). I know because I have an extra 4'' hub that was usless and I had to get a new one for my new motor.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Yes the total leangth of the hub. They are not interchangable parts check Street aqnd performance they have the two parts listed with the size of each hub. The problem is it will change the off set of your damper/pulley
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Grrrr, I guess I'm pulling the hub off and putting the vette back on. I just hope there's enough room to do it in the car. I'd really hate to have to pull the engine back out to change the hub. Thanks for the quick reply. I guess I've got my evening cut out for me now. 
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
I am almost positive that you can do it with the motor in the car. I pulled the pully with no problems so I think the hub should come as well. If not no need to pull the motor just get a lift and remove the motor mount bolts and lift it just enough to get clearance. 
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Right, being as I just put it in, all the chains are hooked up still, and the tranny tail is still unbolted as well as the motor mounts to the frame. The problem is if I lift it I'm not sure I can get the puller in there. The angle will be hitting the crossmember. I guess I'll just have to loosen it as much as possible and then do it the old fashioned way 
