Hastings 4.09375" 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 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
1965-1969 Chevrolet Bel Air
1965-1969 Chevrolet Biscayne
1969 Chevrolet Brookwood
1968-1969 Chevrolet C10 Pickup
1968-1969 Chevrolet C10 Suburban
1968-1969 Chevrolet C20 Pickup
1968-1969 Chevrolet C20 Suburban
1968-1969 Chevrolet C30 Pickup
1967-1969 Chevrolet Camaro
1966-1969 Chevrolet Caprice
1965-1969 Chevrolet Chevelle
1968 Chevrolet Chevy II
1965 Chevrolet Corvette
1968-1969 Chevrolet El Camino
1969 Chevrolet Estate
1965-1969 Chevrolet Impala
1968-1969 Chevrolet K10 Pickup
1968-1969 Chevrolet K10 Suburban
1968-1969 Chevrolet K20 Pickup
1968-1969 Chevrolet K20 Suburban
1968-1969 Chevrolet K30 Pickup
1969 Chevrolet Kingswood
1965-1967 Chevrolet Malibu
1969 Chevrolet Nova
1969 Chevrolet Townsman
1968-1969 GMC C15/C1500 Pickup
1968-1969 GMC C15/C1500 Suburban
1968-1969 GMC C25/C2500 Pickup
1968-1969 GMC C25/C2500 Suburban
1968-1969 GMC C35/C3500 Pickup
1968-1969 GMC K15/K1500 Pickup
1968-1969 GMC K15/K1500 Suburban
1968-1969 GMC K25/K2500 Pickup
1968-1969 GMC K25/K2500 Suburban
1968-1969 GMC K35/K3500 Pickup
1968-1969 Pontiac Acadian
1965-1969 Pontiac Beaumont
1963-1966 Pontiac Bonneville
1963-1966 Pontiac Catalina
1963-1966 Pontiac Grand Prix
1966-1969 Pontiac Laurentian
1966-1969 Pontiac Parisienne
1963-1966 Pontiac Star Chief
1965-1969 Pontiac Strato-Chief
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 2M641.030
California Proposition 65 No
Engborein 4.09375
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 00075538029274