Enginetech R41258-030 is a cast .030" oversize piston ring set for 1957-1980 Chevy, GMC, Buick, Oldsmobile 5.7L-7.5L 348-455ci V8 engines, sold as a complete set covering all cylinders.
Important Notes:
- Sized for cylinders bored .030 inch oversize. Verify your finished bore diameter with a precision gauge before ordering - rings sized for the wrong bore will not seal correctly.
- 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.
| Part Number | R41258-030 |
| Grade | Cast |
| Bore Size | .030" Oversize |
| Ring Stack (Top/2nd/Oil) | 5/64 / 5/64 / 3/16 |
| Standard Bore Diameter | 4.125 in |
| Quantity | Complete set - covers all 8 cylinders |
| Engine | 5.7L-7.5L 348-455ci V8 |
| Year Range | 1957-1980 |
| Makes | Buick, Chevrolet, GMC, Oldsmobile, Pontiac |
| Country of Origin | US |
| OEM Cross-Refs | Hastings:661, FEL-PRO:E-243X, Perfect Circle:50141 |
Sold as a complete piston ring set - one set covers all cylinders and is required per engine.
Fitment:
- 1957-1958 Buick Century 6.0L 364ci V8
- 1957-1958 Buick Roadmaster 6.0L 364ci V8
- 1957-1958 Buick Special 6.0L 364ci V8
- 1957-1958 Buick Super 6.0L 364ci V8
- 1958-1958 Buick Limited 6.0L 364ci V8
- 1958-1958 Chevrolet Del Ray 5.7L 348ci V8
- 1958-1958 Chevrolet Sedan Delivery 5.7L 348ci V8
- 1958-1958 Chevrolet Yeoman 5.7L 348ci V8
- 1958-1958 Chevrolet Truck 5.7L 348ci V8
- 1960-1960 Chevrolet Truck 5.7L 348ci V8
- 1958-1959 Chevrolet Biscayne 5.7L 348ci V8
- 1958-1961 Chevrolet Bel Air 5.7L 348ci V8
- 1958-1961 Chevrolet Impala 5.7L 348ci V8
- 1958-1961 Chevrolet Nomad 5.7L 348ci V8
- 1959-1959 Buick Estate Wagon 6.0L 364ci V8
- 1959-1959 Buick LeSabre 6.0L 364ci V8
- 1959-1960 Chevrolet El Camino 5.7L 348ci V8
- 1959-1961 Chevrolet Brookwood 5.7L 348ci V8
- 1959-1961 Chevrolet Kingswood 5.7L 348ci V8
- 1959-1961 Chevrolet Parkwood 5.7L 348ci V8
- 1960-1960 Buick Estate Wagon 6.0L 364ci V8
- 1960-1960 Buick LeSabre 6.0L 364ci V8
- 1960-1961 Chevrolet C10 Pickup 5.7L 348ci V8
- 1960-1961 Chevrolet C20 Pickup 5.7L 348ci V8
- 1960-1961 Chevrolet C30 Pickup 5.7L 348ci V8
- 1960-1961 Chevrolet K10 Pickup 5.7L 348ci V8
- 1960-1961 Chevrolet K20 Pickup 5.7L 348ci V8
- 1960-1961 Chevrolet Suburban 5.7L 348ci V8
- 1961-1961 Buick Estate Wagon 6.0L 364ci V8
- 1961-1961 Buick LeSabre 6.0L 364ci V8
- ...and 199 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.
