[A26B]

Originally Posted by 65ZR1

Just wondering what everyone is using for clutch bolts when upgrading to the fidanza flywheel. I remember seeing some bolts with more thread engagement somewhere. Is it necessary?

Absolutely the smart move, for several reasons. The stock flywheel is iron & the Fidanza is aluminum. Aluminum has a higher thermal coefficient of expansion which means the bolt to thread clearance will increase with temp, more than iron will, and aluminum has a lower yield strength meaning it will deform more easily under torque and axial load imposed by tightening. All of this means the stock bolts with appx 1/2" less engagement than the aftermarket bolts are more likely to come loose.

Here's the link on where to get them. Just any old bolt that's longer is not good enough. There is a counterbore in the flywheel, sized to allow the shank of the bolt to sink below the face of the flywheel, reducing radial clearance and thereby preventing the bolts from moving. Use these bolts! They have been properly engineered for the job. I've used them.

http://www.zr1products.com/products.html


Ron Woods is an engineer, a first class ZR-1 driver and knows his stuff. We're buying his head studs and cylinders for our (Raptor's) new turbo boosted engine currently under construction.

Jerry