Hastings 3.978"/101.05 mm Bore +.030"/.75 mm, 8-Cylinder Ring Set with 3.00 mm Top Ring, 2.00 mm Second Ring and a First Oil Ring is 4.00 mm.
This Hastings 8-Cylinder Ring Set has a top ring manufactured from ductile iron with chrome ring surface treatment, a second ring manufactured from grey iron with phosphate ring surface treatment. The 1st oil control ring is manufactured of grey iron with a chrome ring surface treatment.

Application Summary:

Year Make/Model
1987-1991 Chevrolet Blazer
1982-1986 Chevrolet C10 Suburban
1988-1993 Chevrolet C1500
1982-1986 Chevrolet C20 Suburban
1988-1993 Chevrolet C2500
1988-1993 Chevrolet C3500
1983-1993 Chevrolet G20
1983-1993 Chevrolet G30
1982-1986 Chevrolet K10 Suburban
1988-1993 Chevrolet K1500
1982-1986 Chevrolet K20 Suburban
1988-1993 Chevrolet K2500
1988-1993 Chevrolet K3500
1982-1986 Chevrolet K5 Blazer
1982-1989 Chevrolet P20
1982-1993 Chevrolet P30
1987 Chevrolet R10
1987-1988 Chevrolet R10 Suburban
1989-1991 Chevrolet R1500 Suburban
1987-1988 Chevrolet R20
1987-1988 Chevrolet R20 Suburban
1989 Chevrolet R2500
1989-1991 Chevrolet R2500 Suburban
1987-1988 Chevrolet R30
1989-1991 Chevrolet R3500
1987 Chevrolet V10
1987-1988 Chevrolet V10 Suburban
1989-1991 Chevrolet V1500 Suburban
1987 Chevrolet V20
1987-1988 Chevrolet V20 Suburban
1989-1991 Chevrolet V2500 Suburban
1987-1988 Chevrolet V30
1989-1991 Chevrolet V3500
1982-1986 GMC C1500
1988-1993 GMC C1500
1982-1986 GMC C1500 Suburban
1982-1986 GMC C2500
1988-1993 GMC C2500
1982-1986 GMC C2500 Suburban
1982-1986 GMC C3500
1988-1993 GMC C3500
1983-1993 GMC G2500
1983-1993 GMC G3500
1982-1991 GMC Jimmy
1982-1986 GMC K1500
1988-1993 GMC K1500
1982-1986 GMC K1500 Suburban
1982-1986 GMC K2500
1988-1993 GMC K2500
1982-1986 GMC K2500 Suburban
1982-1986 GMC K3500
1988-1993 GMC K3500
1982-1989 GMC P2500
1982-1993 GMC P3500
1987 GMC R1500
1987-1991 GMC R1500 Suburban
1987-1989 GMC R2500
1987-1991 GMC R2500 Suburban
1987-1991 GMC R3500
1987 GMC V1500
1987-1991 GMC V1500 Suburban
1987 GMC V2500
1987-1991 GMC V2500 Suburban
1987-1991 GMC V3500
Attributes
1st Oil Groove 4.00
1st Oil Ring Material GREY IRON
1st Oil Ring Surface Treatment CHROME
2nd Groove 2.00
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2D4975.75
California Proposition 65 No
Engborein 3.978
Engboremetric 101.05
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 3.00
Top Ring Surface Treatment CHROME
GTIN 00075538182856