ARP Main Stud Kit - Hex Nuts - 4-Bolt Mains - Chromoly - Black Oxide - Dart - SHP - Small Block Chevy 2120015 measured at the center of

measured at the center of 1/2" rod ends

race proven distributor gear

Made of premium high-strength

NOTE: The 20-121 is not designed for use with some early model Holley carbs

ARP Main Stud Kit - Hex Nuts - 4-Bolt Mains - Chromoly - Black Oxide - Dart - SHP - Small Block Chevy 2120015 measured at the center ofARPs 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, IndyCar, IMSA, NASCAR and NHRA drag racing and marine applications. Since 1968, ARP is the fastener of champions and the world leader in fastener technology. Product Description: Main Stud Kit Hex Nuts 4