Question: Underdrive pulley

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Nov 17, 2010 | 12:56 AM

Camaro_ZL2

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Question: Underdrive pulley

I recently bought and underdrive pulley from a member here he said he pulled this off a 93 z28 yet it bolts on but sticks out a little too much meaning its not going to work why is this? and they did this at the shop i was watching as they tried to sort the problem they even tried flipping it and no go it hits the block.....then we tried to see if it fit my buddies tpi vette and nope..........so why did this fit a 93 and not my 95 z28/b4c?

Nov 17, 2010 | 07:18 AM

camar0corey

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From: Spring Hill, FL

Is it a piggyback pulley? If so you are supposed to install the stock balancer back on top of the underdrive pulley. Then the bolts should be the proper length. If they are still just a little too long at that point shim the bolts with washers, I had to do this on one of the pulleys I ordered years ago, had to use like three washers per bolt that the pulley had shipped with.

Nov 17, 2010 | 01:08 PM

Camaro_ZL2

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No its not piggy back....and i dunno this is just so frustrating i know this part belongs to my car i dont know why i sticks out too much where the belt wont sit right

Nov 17, 2010 | 01:13 PM

*CAMARO*

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Just put the stock pulley back on. You will never tell the difference!

Nov 17, 2010 | 01:35 PM

Camaro_ZL2

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lol nah man i actually wanna do this even it if doesnt do much do i need longer bolts?

Last edited by Camaro_ZL2; Nov 17, 2010 at 01:43 PM.

Nov 17, 2010 | 02:01 PM

*CAMARO*

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I don't see how longer bolts would help. If the pulley doesn't line up with the other accessory pullies it's probably the wrong pulley for your car. Make sure it is tight against the hub.

I know I tried using the hub from a b body LT1 once and it made the pulley stick out too far past the other pulleys. If it doesn't line up and you've already tried flipping it then I'd say it's the wrong pulley.