Hastings 4.0625" Bore +.030" 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 grey iron with phosphate 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
1958 DeSoto Firesweep
1958 Dodge Coronet
1958 Dodge Custom
1958 Dodge Lancer
1958 Dodge Royal
1958 Dodge Sierra
1958 Plymouth Belvedere
1958 Plymouth Custom
1958 Plymouth Fury
1958 Plymouth Plaza
1958 Plymouth Savoy
1958 Plymouth Suburban
1958-1966 Pontiac Bonneville
1958-1966 Pontiac Catalina
1958 Pontiac Chieftain
1962-1966 Pontiac Grand Prix
1964-1966 Pontiac GTO
1958-1966 Pontiac Star Chief
1958 Pontiac Super Chief
1961 Pontiac Tempest
1960-1961 Pontiac Ventura
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 639.030
California Proposition 65 No
Engborein 4.0625
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 PHOSPHATE
GTIN 00075538028673