ARP main and head studs for 2004 LQ9?
1st design uses shorter bolts on each end closest to the intake and the rest are longer.
2nd design uses all the same length bolts
Do you have an old head bolt? Try droping it in all the holes and see if the threads start at the same depth... If it does you have design 2... If you have to different depths its design 1
Trust me you will know right away
Main Studs: #234-5608
LS1 12-pt Studs: #234-4316
LS1 6-pt Studs: #234-4110
LS2 12-pt Studs: #234-4317


