Enginetech R38058-030 is a cast .030" oversize piston ring set for 1968-1990 Chevy, Jeep, Buick, Oldsmobile 5.0L-6.0L 307-368ci 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. For replacement pistons only.
| Part Number | R38058-030 |
| Grade | Cast |
| Bore Size | .030" Oversize |
| Ring Stack (Top/2nd/Oil) | 5/64 / 5/64 / 3/16 |
| Standard Bore Diameter | 3.800 in |
| Quantity | Complete set - covers all 8 cylinders |
| Engine | 5.0L-6.0L 307-368ci V8 |
| Year Range | 1968-1990 |
| Makes | Buick, Cadillac, Chevrolet, Jeep, Oldsmobile, Pontiac |
| Country of Origin | US |
| OEM Cross-Refs | Hastings:696, FEL-PRO:E-288X, Perfect Circle:50849 |
Sold as a complete piston ring set - one set covers all cylinders and is required per engine.
Fitment:
- 1968-1968 Buick GS 350 5.7L 350ci V8
- 1968-1968 Buick LeSabre 5.7L 350ci V8
- 1968-1968 Buick Skylark 5.7L 350ci V8
- 1968-1968 Buick Special 5.7L 350ci V8
- 1968-1968 Buick Sportwagon 5.7L 350ci V8
- 1969-1969 Buick GS 350 5.7L 350ci V8
- 1969-1969 Buick LeSabre 5.7L 350ci V8
- 1969-1969 Buick Skylark 5.7L 350ci V8
- 1969-1969 Buick Special 5.7L 350ci V8
- 1969-1969 Buick Sportwagon 5.7L 350ci V8
- 1969-1969 Jeep J-100 5.7L 350ci V8
- 1969-1969 Jeep Wagoneer 5.7L 350ci V8
- 1969-1970 Jeep J-2700 5.7L 350ci V8
- 1969-1970 Jeep J-3500 5.7L 350ci V8
- 1969-1970 Jeep J-3600 5.7L 350ci V8
- 1969-1970 Jeep J-3700 5.7L 350ci V8
- 1969-1971 Jeep J-100 5.7L 350ci V8
- 1969-1971 Jeep J-2500 5.7L 350ci V8
- 1969-1971 Jeep J-2600 5.7L 350ci V8
- 1969-1971 Jeep J-3800 5.7L 350ci V8
- 1969-1971 Jeep Wagoneer 5.7L 350ci V8
- 1970-1970 Buick Estate Wagon 5.7L 350ci V8
- 1970-1970 Buick GS 5.7L 350ci V8
- 1970-1970 Buick LeSabre 5.7L 350ci V8
- 1970-1970 Buick Skylark 5.7L 350ci V8
- 1970-1970 Buick Sportwagon 5.7L 350ci V8
- 1970-1970 Jeep J-100 5.7L 350ci V8
- 1970-1970 Jeep Wagoneer 5.7L 350ci V8
- 1971-1971 Buick GS 5.7L 350ci V8
- 1971-1971 Buick LeSabre 5.7L 350ci V8
- ...and 57 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.
