Pioneer – Main Bolt Kit


Product Description : Main Bolts
Part Number : 271-855205
Brand : Pioneer

SKU: 855205 Category:

“For over 65 years, Pioneer Automotive Industries has been known throughout the automotive aftermarket as “The Source for Hard-to-Find Products.” During that time, Pioneer has been leading supplier of OEM (Original Equipment Manufacturer) quality level component parts to re-manufacturers who rebuild engines and transmissions to original equipment standards. Pioneer also provides the same commitment to quality driveline components needed to repair and service domestic and import cars and light trucks.”

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.


High compression race engines require a stable crank and bottom end assembly. Main bolts prevent main cap walk and help support the crankshaft assembly while reducing stress on the block threads during assembly. Pioneer Performance Main Bolt Kits are 100% U.S. made, heat treated to 180,000 psi tensile strength and feature rolled threads and undercut shanks for distributing torque stretch which increases the clamping load. Each kit includes Hi-tensile hex nuts and extra thick chamfered washers.

Additional information

Weight 1 lbs
Part Number


Engine / Mfg


Engine Family

Main Bolt Style

Engine Size

Head / Nut Type


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