Enginetech BC450J.020 is a 0.020 undersize main bearing set for 1990-1993 Buick, Oldsmobile, Pontiac 3.3L/3.8L 204-231ci V6 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.
- 1/2 main cap bolts.
- Engines with 1/2 main bolts.
| Part Number | BC450J.020 |
| Bearing Size | 0.020 Undersize |
| Quantity Per Set | 4 main bearings per set |
| Engine | 3.3L/3.8L 204-231ci V6 |
| Year Range | 1990-1993 |
| Makes | Buick, Oldsmobile, Pontiac |
| Country of Origin | IL |
| Weight | 1.0 lbs |
| UPC | 707473000000 |
| OEM Cross-Refs | ACL:4M1822P, FEL-PRO:7144M, King Engine Bearings:MB480AM, MAHLE:MS-1822P |
Complete main bearing set covering all main journals for the V6 application - one set required per engine.
Fitment:
- 1990-1990 Buick Electra 3.8L 231ci V6
- 1990-1990 Buick Reatta 3.8L 231ci V6
- 1990-1990 Buick Riviera 3.8L 231ci V6
- 1990-1990 Oldsmobile 98 3.8L 231ci V6
- 1990-1990 Oldsmobile Delta 88 3.8L 231ci V6
- 1990-1990 Oldsmobile Toronado 3.8L 231ci V6
- 1990-1991 Buick LeSabre 3.8L 231ci V6
- 1990-1991 Pontiac Bonneville 3.8L 231ci V6
- 1990-1993 Buick Regal 3.8L 231ci V6
- 1991-1991 Buick Reatta 3.8L 231ci V6
- 1991-1991 Oldsmobile Cutlass Calais 3.3L 204ci V6
- 1991-1992 Oldsmobile Toronado 3.8L 231ci V6
- 1991-1993 Buick Century 3.3L 204ci V6
- 1991-1993 Buick Park Avenue 3.8L 231ci V6
- 1991-1993 Buick Riviera 3.8L 231ci V6
- 1991-1993 Buick Skylark 3.3L 204ci V6
- 1991-1993 Oldsmobile 98 3.8L 231ci V6
- 1991-1993 Oldsmobile Cutlass Ciera 3.3L 204ci V6
- 1991-1993 Oldsmobile Cutlass Cruiser 3.3L 204ci V6
- 1992-1993 Buick LeSabre 3.8L 231ci V6
- 1992-1993 Oldsmobile 88 3.8L 231ci V6
- 1992-1993 Oldsmobile 98 3.8L 231ci V6
- 1992-1993 Oldsmobile Achieva 3.3L 204ci V6
- 1992-1993 Oldsmobile Silhouette 3.8L 231ci V6
- 1992-1993 Pontiac Bonneville 3.8L 231ci V6
- 1992-1993 Pontiac Grand Am 3.3L 204ci V6
- 1992-1993 Pontiac Trans Sport 3.8L 231ci V6
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.
