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View Full Version : GM Upper A arm bolts. Fine/course thread?



Samckitt
07-09-2008, 01:30 PM
Which is better, fine or course thread?

Thanks

David Pozzi
07-09-2008, 02:22 PM
From a strength standpoint, fine is stronger. But coarse bolts are what the factory used, and it's easier to back them off for alignment. I think that coarse bolts are plenty strong, as long as they are Grade 8, they are usually 1/2" bolts on later models, but first gen Camaros have 7/16" coarse bolts and they work, but are probably getting close to the limit. I'm in favor of double nutting the bolts for hard use.

Hey, I thought I was going to be at Road America next week for the B.R.I.C, but I had to cancel out. It's Lola's 50th Anniversary!
David

Samckitt
07-09-2008, 05:58 PM
I bought fine & put them on one side & then wondered if it made a difference. The A arms themselves are adjustable, so no need for shims.

Thanks