Enginetech R40658-STD is a cast standard bore piston ring set for 1968-1980 Buick, Oldsmobile, Cadillac 5.7L 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.
| Part Number | R40658-STD |
| Grade | Cast |
| Bore Size | Standard |
| Ring Stack (Top/2nd/Oil) | 5/64 / 5/64 / 3/16 |
| Standard Bore Diameter | 4.057 in |
| Quantity | Complete set - covers all 8 cylinders |
| Engine | 5.7L 350ci V8 |
| Year Range | 1968-1980 |
| Makes | Buick, Cadillac, Oldsmobile |
| Country of Origin | US |
| OEM Cross-Refs | Hastings:697, FEL-PRO:E-297X, Perfect Circle:50847 |
Sold as a complete piston ring set - one set covers all cylinders and is required per engine.
Fitment:
- 1968-1968 Oldsmobile Cutlass 5.7L 350ci V8
- 1968-1968 Oldsmobile Delmont 88 5.7L 350ci V8
- 1968-1968 Oldsmobile Delta 88 5.7L 350ci V8
- 1968-1968 Oldsmobile F85 5.7L 350ci V8
- 1968-1968 Oldsmobile Vista Cruiser 5.7L 350ci V8
- 1968-1969 Oldsmobile Delta 88 5.7L 350ci V8
- 1968-1970 Oldsmobile Cutlass 5.7L 350ci V8
- 1968-1970 Oldsmobile Delta 88 5.7L 350ci V8
- 1968-1970 Oldsmobile F85 5.7L 350ci V8
- 1968-1970 Oldsmobile Vista Cruiser 5.7L 350ci V8
- 1968-1971 Oldsmobile Cutlass 5.7L 350ci V8
- 1968-1971 Oldsmobile Delta 88 5.7L 350ci V8
- 1968-1971 Oldsmobile F85 5.7L 350ci V8
- 1968-1971 Oldsmobile Vista Cruiser 5.7L 350ci V8
- 1968-1972 Oldsmobile F85 5.7L 350ci V8
- 1968-1974 Oldsmobile Vista Cruiser 5.7L 350ci V8
- 1968-1974 Oldsmobile Cutlass 5.7L 350ci V8
- 1976-1977 Oldsmobile Cutlass 5.7L 350ci V8
- 1979-1980 Oldsmobile Cutlass 5.7L 350ci V8
- 1968-1974 Oldsmobile Cutlass Supreme 5.7L 350ci V8
- 1976-1977 Oldsmobile Cutlass Supreme 5.7L 350ci V8
- 1979-1980 Oldsmobile Cutlass Supreme 5.7L 350ci V8
- 1968-1974 Oldsmobile Delta 88 5.7L 350ci V8
- 1976-1980 Oldsmobile Delta 88 5.7L 350ci V8
- 1969-1971 Oldsmobile Delta 88 5.7L 350ci V8
- 1970-1970 Oldsmobile Cutlass 5.7L 350ci V8
- 1970-1970 Oldsmobile F85 5.7L 350ci V8
- 1970-1970 Oldsmobile Vista Cruiser 5.7L 350ci V8
- 1971-1971 Oldsmobile Cutlass 5.7L 350ci V8
- 1971-1971 Oldsmobile Cutlass Supreme 5.7L 350ci V8
- ...and 40 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.
