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Don't want to hijack this thread but my arp studs are not long enough for the nut and the washer(very little in the head). do they make different lengths? decks been milled .0125




Yes. Different manufacturer heads require different lengths.
For example ARP-245-4312 is just the 7/16 valley studs for World blocks (tad longer)



stock block and stock heads and the other studs-nuts are long enough, the studs are screwed all the way in right?