Enginetech R10258-STD is a cast standard bore piston ring set for 1980-1995 Chevy, GMC, Buick, Pontiac 4.9L/5.7L 301-350ci V8 engines, sold as a complete set covering all cylinders.
Important Notes:
- Sized for standard (unmachined) cylinder bores. Verify your finished bore diameter with a precision gauge before ordering.
- File-fit and gap each ring to the manufacturer's end-gap specification for your application before installation. Improper end gap causes blow-by or ring-end butting under heat.
- Replace piston rings as a complete set during any rebuild. One set covers all cylinders for the engine.
- Cast. 5/64 5/64 3/16. Shallow oil ring. Except short light weight pistons.
| Part Number | R10258-STD |
| Grade | Cast |
| Bore Size | Standard |
| Ring Stack (Top/2nd/Oil) | 5/64 / 5/64 / 3/16 |
| Standard Bore Diameter | 4.000 in |
| Quantity | Complete set - covers all 8 cylinders |
| Engine | 4.9L/5.7L 301-350ci V8 |
| Year Range | 1980-1995 |
| Makes | Buick, Chevrolet, GMC, Pontiac |
| Country of Origin | US |
| OEM Cross-Refs | Hastings:5615, FEL-PRO:E-377X |
Sold as a complete piston ring set - one set covers all cylinders and is required per engine.
Fitment:
- 1980-1980 Buick Century 4.9L 301ci V8
- 1980-1980 Buick Electra 4.9L 301ci V8
- 1980-1980 Buick LeSabre 4.9L 301ci V8
- 1980-1980 Buick Regal 4.9L 301ci V8
- 1980-1980 Pontiac Bonneville 4.9L 301ci V8
- 1980-1980 Pontiac Catalina 4.9L 301ci V8
- 1980-1980 Pontiac Grand Prix 4.9L 301ci V8
- 1980-1981 Pontiac Firebird 4.9L 301ci V8
- 1980-1981 Pontiac Grand LeMans 4.9L 301ci V8
- 1986-1988 Chevrolet Caprice 5.7L 350ci V8
- 1986-1991 Chevrolet Corvette 5.7L 350ci V8
- 1987-1987 Chevrolet R10 5.7L 350ci V8
- 1987-1987 Chevrolet V10 5.7L 350ci V8
- 1987-1987 Chevrolet V20 5.7L 350ci V8
- 1987-1987 GMC P2500 5.7L 350ci V8
- 1987-1987 GMC R1500 5.7L 350ci V8
- 1987-1987 GMC V1500 5.7L 350ci V8
- 1987-1987 GMC V2500 5.7L 350ci V8
- 1987-1988 Chevrolet R10 Suburban 5.7L 350ci V8
- 1987-1988 Chevrolet R20 5.7L 350ci V8
- 1987-1988 Chevrolet R20 Suburban 5.7L 350ci V8
- 1987-1988 Chevrolet R30 5.7L 350ci V8
- 1987-1988 Chevrolet V10 Suburban 5.7L 350ci V8
- 1987-1988 Chevrolet V20 Suburban 5.7L 350ci V8
- 1987-1988 Chevrolet V30 5.7L 350ci V8
- 1987-1989 Chevrolet P20 5.7L 350ci V8
- 1987-1989 GMC R2500 5.7L 350ci V8
- 1987-1991 GMC Jimmy 5.7L 350ci V8
- 1987-1991 GMC R1500 Suburban 5.7L 350ci V8
- 1987-1991 GMC R2500 Suburban 5.7L 350ci V8
- ...and 48 additional applications
Enginetech piston ring sets are manufactured to OEM specifications and offered in both premium and cast grades to match the demands of stock rebuilds and moderate-performance builds. Each set is application-specific, with ring widths and end-gap characteristics matched to the bore and groove geometry of the engine family it serves. Ring sets are sold by bore size - standard for unmachined bores, with oversizes for blocks that have been bored and honed - so verify your finished bore diameter with a precision gauge before ordering, since rings sized for the wrong bore will not seal correctly. Always file-fit and gap each ring to the manufacturer's specification for your application, and replace rings as a complete set during any rebuild. Enginetech documents every set with the ring stack dimensions, bore size, and cross-references so the correct set reaches the bench the first time.
WARNING: This product can expose you to chemicals including lead and nickel, which are known to the State of California to cause cancer, birth defects, or other reproductive harm.
