ARP Head Bolt Kit

• Quality hex-head, hardened stainless steel bolts with a show polished  corrosion-resistant finish
• Tensile strength rated @ 180,000 psi; superior and stronger than OEM and grade 8 fasteners
• Precision J-form threads for optimum engagement, to prevent galling and promote more consistent torque loading
• Wide under head flange bolts and hardened chamfered washers provide even load distribution for optimum sealing of surfaces to prevent leaks
• Eliminate thread problems associated with chromed and soft stainless steel hardware
• Kit includes all bolts required for one motor and moly assembly lubricant for installation
• Manufactured by ARP
• 3.125" under head length for M8
• Made in the U.S.A.

Fitment Guide

Evolution/Twin Cam fits:

M8 fits:

Video
https://youtu.be/JZbSxAfoEX0

History & Background on ARP

They say that to be successful you must identify a need and satisfy it. Back the early 1970s, racing enthusiast Gary Holzapfel saw that many of his friends’ broken engines were caused by fastener failure.

At the time, there were no commercially available studs and bolts up to the challenge. So Holzapfel called upon his many years of fastener making experience for a leading aerospace subcontractor and founded ARP (Automotive Racing Products).

In the ensuing years, the firm has grown from what was literally a backyard garage workshop into a highly diversified manufacturer with seven operational entities in Southern California with a combined area in excess of 200,000 square feet. These include forging, heat-treating, machining, quality control finishing and packaging/warehousing facilities in Santa Paula and Ventura, California.

There is even a unique racing-themed restaurant at the main Santa Paula facility - called “ Hozy’s Grill” - which is open to the public.

Today, ARP’s product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline and throughout the suspension and frame. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications.