Total Seal Classic Race Piston Rings - 4.600 in Bore - File Fit - 8-Cylinder COR21245 The mounting holes are slotted

The mounting holes are slotted allowing front to rear adjustment for fine tuning

1979-1981 GMC K1500Fits all GM TH350 and TH250 automatic transmissions

The adjustable droop sop allows user to dial in front end rise during launch

Powdered-metal gusher bearings

Total Seal Classic Race Piston Rings - 4.600 in Bore - File Fit - 8-Cylinder COR21245 The mounting holes are slottedProduct Description: Piston Rings Classic Race 4. 600 in Bore File Fit 0. 043 x 0. 043 in x 3. 0 mm Thick Low Tension Ductile Iron 8 Cylinder Total Seal's patented Gapless Piston rings provide increased performance through unmatched sealing of the cylinder and combustion gasses in the combustion chamber. Increased horsepower and torque along with longer engine life are just a couple of the reasons why Total Seal's Gapless A Piston rings are the best