Okay, so I am a Chevy guy so I need some help from you GMC guys...
On Chevy 216/235/261 engines, the harmonic balancer hub to pulley are attached with 6 rivets, whereas on the 228/248/270/302 GMC's it looks like bolts are used in lieu of the rivets. Can anyone give the bolt diameters for those six bolts used on the GMC HB?
Thanks!
Paul