ARP – Main Bolt Kit


Product Description : Main Bolts
Part Number : 030-134-5203
Brand : ARP

SKU: ARP 134-5203 Category:

ARP was founded in 1968 and is located in Ventura California. All processes from raw wire to finished fasteners are handled in-house right here in the USA. ARP offers over 3000 part numbers covering your automotive or performance project from head bolt to wheel stud. Whether it’s a stock item or a custom fabrication, ARP has it covered.

Some parts are not legal for use in California or other states with similar laws / regulations

Motor Vehicles

WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

Electrical Cords

WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.


ARP main bolts are designed to meet the exacting standards and demands of professional engine builders. Forged from 8740 chrome moly steel, all ARP main bolts feature a reduced wrenching head, large under-head radius and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives them about 2000% better fatigue strength than most main bolts that are threaded prior to heat-treating. The popular High-Performance Series is rated at 180,000 psi and is a premium replacement for OEM fasteners. Pro Series main bolts are application-specific, rated at 190,000 psi and designed for use in competition engines. Hardened parallel-ground washers are included with each kit.

Additional information

Weight 1 lbs
Part Number


Engine / Mfg



Engine Family

Main Bolt Style

Engine Size

Head / Nut Type


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