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


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures