Notes: Chevy LS1 LS4 LS6 LM7-5.3 LQ4-6.0 & RL4-4.8 12pt. Manufacturer: ARP (Automotive Racing Products). Automotive Racing Products (ARP) started in 1968, in Southern California. They produce a number of specialty products like cylinder head fastener kits, connecting rod bolts, exhaust manifold/header fastener kits, oil pan fastener kits, piston ring compressors, and more.
