Simon ARP are the most well known and longest well known supplier of head studs, so it would be a sure bet that they are of that brand.

Just give PMS a call im sure they would be able to track down suppliers in 2002. It shouldnt be too hard for them.

So did u look at the bores? how did they look, out of round at all or still in smicko condition?

Are u porting the heads? what type of retainers and springs are u using? Are they real jun cams or profile copies??

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