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strength is the key, 8.8 is medium, look for 10.9 for security
ones above I would guess are 8.8
10.9>
Made from alloy steel quenched, tempered, and zinc plated. Best for automotive use and other areas where high strength is needed.
Ben I wouldnt go any furhter than 250 bhp in 1st and 2nd cause mine wheelspins so much as it is.
Its fine in a straight line where easily controllable but trying to exit tight corners becomes a proper pain in the tits, the torque just causes understeer.
Id expect to see wheelspin through 1st...
update, I bored out one enough to trial fit the fronts.
and....
they dont fit over the calipers.... f**king 4 pots.
so they are for sale. 350 plus del if anyones interested?
the 3rd hole i presume is for the original belt to be bolted onto or the harness, so I dont see a problem with using it, otherwise whats it there for?!