ARP studs are even better
than head bolts. ARP head bolts have threads only at the bottom of the
bolt where it screws into the block. ARP studs have threads both at the
bottom and the top where it attaches to the head. Thus, it has twice
the clamping capacity of an ARP head bolt. This is the ultimate upgrade
to your Engine's Head along with the HKS Metal Head Gasket.
H Series
H22A
H23
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