JE Pistons Premium Race Series File Fit Piston Rings - 4.560 in Bore - 0.047 in x 0.047 in x 3.0 mm Thick - Low Tension - Nitride - 8-Cylinder 6-7/8 5/8 in 36 Spline to

5/8 in 36 Spline to 3/4 in Smooth

1982-1982 Mercury LN7

It eliminates wearing of the threads and the possibility of bottoming the rocker shaft bolts in the head

5" diameterTo us

1983-1986 Pontiac Bonneville

JE Pistons Premium Race Series File Fit Piston Rings - 4.560 in Bore - 0.047 in x 0.047 in x 3.0 mm Thick - Low Tension - Nitride - 8-Cylinder 6-7/8 5/8 in 36 Spline toProduct Description: Piston Rings Premium Race Series 4. 560 in Bore File Fit 0. 043 in x 0. 043 in x 3. 0 mm Thick Low Tension Steel Nitride 8 Cylinder JE Pistons is the leader in high performance forged pistons. JE Pistons has built a reputation that the competition can only follow. JE Pistons has a history of manufacturing the highest quality pistons and components that professional engine builders, race teams, and high performance enthusiasts