Hastings 4.120" Bore +.020" Over Size, 8-Cylinder Ring Set with 5/64" Top Ring, 5/64" Second Ring and a First Oil Ring is 3/16".
This Hastings 8-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
1975 Buick LeSabre
1975 Oldsmobile 98
1975 Oldsmobile Custom Cruiser
1975 Oldsmobile Delta 88
1967-1978 Pontiac Bonneville
1967-1978 Pontiac Catalina
1967-1970 Pontiac Executive
1967-1979 Pontiac Firebird
1973-1975 Pontiac Grand Am
1975-1977 Pontiac Grand LeMans
1967-1977 Pontiac Grand Prix
1971-1978 Pontiac Grand Safari
1972-1975 Pontiac Grandville
1967-1973 Pontiac GTO
1967-1974 Pontiac Laurentian
1968-1977 Pontiac LeMans
1967-1969 Pontiac Parisienne
1971-1974 Pontiac Parisienne
1968-1970 Pontiac Tempest
Attributes
1st Oil Groove 3/16
1st Oil Ring Material STEEL RAIL/STAINLESS EXP
2nd Groove 5/64
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2M644.020
California Proposition 65 No
Engborein 4.120
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 00075538029663