Hastings 4.151" Standard Bore, Single Cylinder Ring Set with 5/64" Top Ring, 1/16" Second Ring and a First Oil Ring is 3/16".
This Hastings Single Cylinder Ring Set has a top ring manufactured from steel with plasma moly ring surface treatment, a second ring manufactured from grey iron with phosphate ring surface treatment. The 1st oil control ring is manufactured of steel rail/stainless expansion with a chrome rail ring surface treatment.

Application Summary:

Year Make/Model
1970-1976 Pontiac Bonneville
1970-1976 Pontiac Catalina
1970 Pontiac Executive
1971-1976 Pontiac Firebird
1973-1975 Pontiac Grand Am
1975-1976 Pontiac Grand LeMans
1970-1976 Pontiac Grand Prix
1971-1974 Pontiac Grand Safari
1976 Pontiac Grand Safari
1971-1975 Pontiac Grandville
1970-1973 Pontiac GTO
1971-1974 Pontiac Laurentian
1970-1974 Pontiac LeMans
1976 Pontiac LeMans
1970-1974 Pontiac Parisienne
Attributes
1st Oil Groove 3/16
1st Oil Ring Material STEEL RAIL/STAINLESS EXP
2nd Groove 1/16
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2M643S
California Proposition 65 No
Engborein 4.151
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 5/64
Top Ring Surface Treatment PLASMA MOLY
GTIN 00075538029502