ARP Stainless Steel Stud Kit - (4) M8 x 1.25" x 51mm Turnlock Fastener The pressure upon the head

The pressure upon the head can be adjusted by replacing the special foam rubber pads placed between the earmuff and the helmet

spread port headers are required since the center ports are spread further apart then stock GM products

11-1/2 in Long

30 to 125 psi

and Allison C-3 and C-4

ARP Stainless Steel Stud Kit - (4) M8 x 1.25" x 51mm Turnlock Fastener The pressure upon the headARPs 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: Stud 8 mm x 1. 25 Thread 2