Head bolts are designed to give a certain clamping force at a certain torque. The smaller diameter is to allow most of the stretching to occur outside of the threaded portion. I would try and get the real thing.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!