Enginetech BC300J.020 is a 0.020 undersize main bearing set for 1966-1980 Jeep, Buick, Pontiac 5.6L/5.7L 340-350ci V8 engines.
Important Notes:
- Sized for crankshaft main journals machined .020 inch undersize. Measure journal diameter before installation - installing on the wrong journal size will cause immediate clearance failure.
- Always replace main bearings as a complete set. Never mix new bearings with used bearings - uneven wear and clearance differences will cause premature failure.
| Part Number | BC300J.020 |
| Bearing Size | 0.020 Undersize |
| Quantity Per Set | 5 main bearings per set |
| Engine | 5.6L/5.7L 340-350ci V8 |
| Year Range | 1966-1980 |
| Makes | Buick, Jeep, Pontiac |
| Country of Origin | IL |
| Weight | 1.75 lbs |
| UPC | 707473000000 |
| OEM Cross-Refs | ACL:5M1457P, Clevite:MS-1457P, FEL-PRO:4418M, King Engine Bearings:MB5516AM, MAHLE:MS-1457P |
Complete main bearing set covering all main journals for the V8 application - one set required per engine.
Fitment:
- 1966-1966 Buick LeSabre 5.6L 340ci V8
- 1966-1966 Buick Skylark 5.6L 340ci V8
- 1966-1966 Buick Special 5.6L 340ci V8
- 1966-1966 Buick Sportwagon 5.6L 340ci V8
- 1967-1967 Buick Gran Sport 5.6L 340ci V8
- 1967-1967 Buick LeSabre 5.6L 340ci V8
- 1967-1967 Buick Skylark 5.6L 340ci V8
- 1967-1967 Buick Special 5.6L 340ci V8
- 1967-1967 Buick Sportwagon 5.6L 340ci V8
- 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
- ...and 32 additional applications
Enginetech main bearings are engineered to OEM specifications, drawing on over 40 years of engine rebuilding expertise to deliver the precise clearance, crush, and eccentricity required for long-term durability under both stock and moderate-performance loads. Each set is application-specific: materials, wall thickness, oil clearance, and surface finish are all matched to the crankshaft main journal geometry and operating loads of the engine family it serves. Main bearings are a wear component and must be selected to match the crankshaft main journal size - bearings sized for standard journals will not seat correctly on undersize-machined journals and vice versa, so verify your journal measurement with a precision micrometer before ordering or installing. Always replace main bearings as a complete set. Mixing new bearings with used bearings produces uneven oil clearance across the crankshaft and accelerates wear on the freshly installed bearings - the small cost of a complete set is insurance against premature failure on the bearings you just paid to install. Enginetech documents every set with clear application-specific notes, journal-size designation, and cross-references so the right part lands on 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. For more information, go to www.P65Warnings.ca.gov.
