ARP Pontiac Head Stud Kit - 6 Point Spray Can Rack For drag use

For drag use

1989-1989 Isuzu I-Mark

2-1/2 in OD

and 13015) and you have a regulator with vastly different characteristics

ARP Pontiac Head Stud Kit - 6 Point Spray Can Rack For drag useARPs 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: Cylinder Head Stud Kit Hex