ARP Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - Black Oxide - Big Block Chevy 235-4313 1139801 The oil pump shaft opening

The oil pump shaft opening must be enlarged to a 9/16" diameter

1959-1959 GMC PM250

which saves you time and money and reduces the impact on the environment

Includes nylon mounting hardwareDerale has been the leader in performance cooling for decades

00 in Thread

ARP Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - Black Oxide - Big Block Chevy 235-4313 1139801 The oil pump shaft openingARPs 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 12