Main Stud Kit for Ford 390-428 cid FE series (12 pt nuts, 10 studs) modification to #5 cap required

Main Stud Kit for Ford 390-428 cid FE series (12 pt nuts, 10 studs) modification to #5 cap requiredThere are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs

ARP’s rugged primer shafts are rated at 170

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

ARP offers High Performance Series bolts that aremade from a premium grade chrome moly and hardened to a nominal tensile strength of 180

For the most severe applications

The shaft is made from heat-treated

Special ARP Pro Series NASCAR type stud kits have one of the studs drilled to facilitate sealing the carburetor in the engine by race officials

Available inblack oxide finished chrome moly or rust-proofstainless steel

Specially drilled “NASCAR” models are available for those who wish to safety wire their header bolts to prevent loosening

and precision J-form threads rolled after heat-treat to create a fastener that has threads 2000% stronger than others

marine and drag racing engines – including those with superchargers and/ or nitrous oxide injection systems – ARP offers replacement rod bolts in three different models

including use of a premium grade chrome moly alloy

000 psi forthe 8740 material and 220