A-Series ARP HSA11 Head Stud Set.
Used by KAD and recommended for all performance A-Series engines.
High-quality materials ensure cylinder head can be tightened down effectively and studs will not stretch over time.
Set includes 11 standard length head studs. We recommend modifying your engine for the extra 2 studs.
Total length – 4.250”
3/8UNC / Block thread – 0.700”
3/8UNF / Head nut thread – 1.250”
Head nut and washer height – 0.500”