Enginetech M40056-STD is a premium standard bore piston ring set for 1965-1995 Chevy, GMC, Ford, Oldsmobile 3.9L-4.9L 240-300ci I6 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.
- Except Premium. 5/64 5/64 3/16. Deep oil ring.
| Part Number | M40056-STD |
| Grade | Premium |
| 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 6 cylinders |
| Engine | 3.9L-4.9L 240-300ci I6 |
| Year Range | 1965-1995 |
| Makes | Chevrolet, Ford, GMC, Oldsmobile, Pontiac |
| Country of Origin | US |
| OEM Cross-Refs | Hastings:2M5712, Hastings:2M592, FEL-PRO:E-229K, Perfect Circle:40664 |
Sold as a complete piston ring set - one set covers all cylinders and is required per engine.
Fitment:
- 1965-1965 Ford F-100 3.9L 240ci I6
- 1965-1965 Ford F-250 3.9L 240ci I6
- 1965-1965 Ford F-350 3.9L 240ci I6
- 1965-1965 Ford P-350 3.9L 240ci I6
- 1965-1967 Ford Galaxie 3.9L 240ci I6
- 1965-1970 Ford Country Sedan 3.9L 240ci I6
- 1965-1970 Ford Country Squire 3.9L 240ci I6
- 1965-1970 Ford Custom 3.9L 240ci I6
- 1965-1970 Ford LTD 3.9L 240ci I6
- 1965-1970 Ford Ranch Wagon 3.9L 240ci I6
- 1965-1972 Ford Country Sedan 3.9L 240ci I6
- 1965-1972 Ford Country Squire 3.9L 240ci I6
- 1965-1972 Ford Custom 3.9L 240ci I6
- 1965-1972 Ford LTD 3.9L 240ci I6
- 1965-1972 Ford Ranch Wagon 3.9L 240ci I6
- 1965-1976 Ford P-350 4.9L 300ci I6
- 1965-1983 Ford F-100 4.9L 300ci I6
- 1965-1995 Ford F-250 4.9L 300ci I6
- 1965-1995 Ford F-350 4.9L 300ci I6
- 1966-1967 Ford Bronco 3.9L 240ci I6
- 1966-1972 Ford P-350 3.9L 240ci I6
- 1966-1974 Ford F-100 3.9L 240ci I6
- 1966-1974 Ford F-250 3.9L 240ci I6
- 1966-1974 Ford F-350 3.9L 240ci I6
- 1968-1970 Ford Custom 500 3.9L 240ci I6
- 1968-1970 Ford Galaxie 500 3.9L 240ci I6
- 1968-1972 Ford Custom 500 3.9L 240ci I6
- 1968-1972 Ford Galaxie 500 3.9L 240ci I6
- 1968-1973 Ford P-100 3.9L 240ci I6
- 1969-1974 Ford E-100 Econoline 3.9L 240ci I6
- ...and 96 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.
