ARP High Performance Series Main Bolt Kit - SB Chevy - 4-Bolt Main 39000609 Compatible with any high volume

Compatible with any high volume electric or mechanical fuel pump

1-1/2" baffled breather tubes for proper crankcase venting

The new Series 2A has new features never seen before in the Head and Neck Restraint market

9/16 in Head

ARP High Performance Series Main Bolt Kit - SB Chevy - 4-Bolt Main 39000609 Compatible with any high volumeHigh Performance Series Main Bolts reduced wrenching hex head and wide are flange evenly distribute the load during torquing. Complete with hardened, parallel ground washers. 170, 000 psi tensile strength. ARPs product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1,