Hastings 4.390" Bore Piston Rings 5/64 x 5/64 x 3/16" Thick Standard Tension Moly - 8 Cylinder 21411506 When using screw-in studs on

When using screw-in studs on a factory cylinder head it is necessary to machine down the stud boss equal to the thickness of the new stud's jam nut plus the guide plate thickness

who started the business by manufacturing by hand a small quantity of replacement fiber and aluminum timing gears for trucks and automobiles

1979-1991 GMC K3500

1/2 in NPT Dual Outlets

Adjustable arms are slotted for quick adjustment with included thumbscrew knobs to fit a variety of radiator heights

Hastings 4.390" Bore Piston Rings 5/64 x 5/64 x 3/16" Thick Standard Tension Moly - 8 Cylinder 21411506 When using screw-in studs onProduct Description: Piston Rings 4. 390 in Bore Drop In 5 64 x 5 64 x 3 16 in Thick Standard Tension Steel Plasma Moly 8 Cylinder For nearly 100 years, Hastings has earned its reputation as a leader in piston ring technology.