Enginetech BC321J.030 is a 0.030 undersize main bearing set for 1955-1973 Dodge, Chrysler, Plymouth 3.7L-5.6L 225-340ci I6 engines.
Important Notes:
- Sized for crankshaft main journals machined .030 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.
- Engines with 3.366 flange OD.
| Part Number | BC321J.030 |
| Bearing Size | 0.030 Undersize |
| Quantity Per Set | 7 main bearings per set |
| Engine | 3.7L-5.6L 225-340ci I6 |
| Year Range | 1955-1973 |
| Makes | Chrysler, Dodge, Plymouth |
| Country of Origin | IL |
| Weight | 1.25 lbs |
| UPC | 707473000000 |
| OEM Cross-Refs | ACL:5M540P, FEL-PRO:4923M, King Engine Bearings:MB558AM, MAHLE:MS-540AL, MAHLE:MS-963P |
Complete main bearing set covering all main journals for the I6 application - one set required per engine.
Fitment:
- 1955-1955 Chrysler Nassau 4.9L 301ci V8
- 1955-1955 Chrysler Newport 4.9L 301ci V8
- 1955-1955 Chrysler Windsor 4.9L 301ci V8
- 1956-1956 Plymouth Fury 4.5L 277ci V8
- 1956-1957 Plymouth Belvedere 4.5L 277ci V8
- 1956-1957 Plymouth Plaza 4.5L 277ci V8
- 1956-1957 Plymouth Savoy 4.5L 277ci V8
- 1956-1957 Plymouth Suburban 4.5L 277ci V8
- 1958-1965 Plymouth Fury 5.2L 318ci V8
- 1959-1959 Dodge Coronet 5.3L 326ci V8
- 1959-1959 Dodge Custom 5.3L 326ci V8
- 1959-1959 Dodge Lancer 5.3L 326ci V8
- 1959-1959 Dodge Truck 5.2L 318ci V8
- 1959-1959 Dodge D100 Pickup 5.2L 318ci V8
- 1968-1973 Dodge D100 Pickup 5.2L 318ci V8
- 1959-1959 Dodge D200 Pickup 5.2L 318ci V8
- 1968-1973 Dodge D200 Pickup 5.2L 318ci V8
- 1959-1959 Dodge D300 Pickup 5.2L 318ci V8
- 1968-1973 Dodge D300 Pickup 5.2L 318ci V8
- 1959-1959 Dodge W100 Pickup 5.2L 318ci V8
- 1968-1973 Dodge W100 Pickup 5.2L 318ci V8
- 1959-1959 Dodge W200 Pickup 5.2L 318ci V8
- 1968-1973 Dodge W200 Pickup 5.2L 318ci V8
- 1959-1959 Dodge W300 Pickup 5.2L 318ci V8
- 1968-1973 Dodge W300 Pickup 5.2L 318ci V8
- 1960-1960 Dodge D100 Series 5.2L 318ci V8
- 1960-1960 Dodge D200 Series 5.2L 318ci V8
- 1960-1960 Dodge D300 Series 5.2L 318ci V8
- 1960-1960 Dodge Matador 5.2L 318ci V8
- 1960-1960 Dodge Phoenix 5.2L 318ci V8
- ...and 169 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.
