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Paul Workman · 10-20-2017

Just thinking out loud here, but why use a "grade 8" when the bolt is screwed into aluminum? Yeah, I used 'em on Ami's SBC (cast iron) heads, but grade 8 on aluminum?

And, a agree - far as having hex-heads go (tho a 12 point works on the (I'll call it) star type bolts, IIRC.

10-20-2017	#7
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Header Bolts Just thinking out loud here, but why use a "grade 8" when the bolt is screwed into aluminum? Yeah, I used 'em on Ami's SBC (cast iron) heads, but grade 8 on aluminum? And, a agree - far as having hex-heads go (tho a 12 point works on the (I'll call it) star type bolts, IIRC. __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry