parks450

iTrader: (17)

I have a UD pulley and it is going on my 5.3l that has a c5 accessory drive, the pulley is a c5 pulley to. The UD pulley has a keyway slot in it but the stocker doesnt. Do I need to rtv the keyway slot so it doesnt leak?

ls1 1990 VN

No, you need to fit the keyway so the pulley stays put & doesn't move.

thunderstruck507

iTrader: (18)

The stock crank isn't keyed so you can just install the pulley. No need to do anything with the slot in the pulley.

parks450

iTrader: (17)

Where the pulley goes on their is no keyway, it presses on. But the stock pulley has no groove for a keyway hence no keyway. The UD pulleys have a groove. So does that groove need to be filled?

thunderstruck507

iTrader: (18)

I have the Corvette pulley system on my car as well. The pulley has been on there for a year and a half with an open key way.

The key way is a design feature of the pulley not utilized with a stock crank. Nothing will leak. The pulley can be installed normally as if it were stock.