View Full Version : head bolts

08-20-2005, 12:03 AM
This isn't a need to know, just curious- what are head bolts made from? I've ruled out meatloaf and peanut brittle.
Just wondering if they are a grade- anything in particular, or if they're an alloy specifically hardened and tempered for that use.

3 Phase Lightbulb
08-20-2005, 12:23 AM
I think grade 8 or better.. The aftermarket head bolts I bought for a 4-cyl motorcycle engine were grade 8 anyway... Not sure what grade the OEM bolts were but the grade 8 feel stronger.. I think the OEM were chocolate brittle but they didn't taste good at all.


08-20-2005, 01:05 AM
Beats me...here's a n ARP tech page (advertisement):