Enginetech BC204J.25 is a 0.25mm undersize main bearing set for 2001-2024 Chevy, GMC, Hummer 6.6L 400-403ci V8 engines.
Important Notes:
- Sized for crankshaft main journals machined .25mm 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 | BC204J.25 |
| Bearing Size | 0.25mm Undersize |
| Quantity Per Set | 5 main bearings per set |
| Engine | 6.6L 400-403ci V8 |
| Year Range | 2001-2024 |
| Makes | Chevrolet, GMC, Hummer |
| Country of Origin | US |
| Weight | 1.5 lbs |
| UPC | 707473000000 |
| OEM Cross-Refs | ACL:5M7325P, FEL-PRO:7429M, King Engine Bearings:MB5724CP, MAHLE:MS-2218P |
Complete main bearing set covering all main journals for the V8 application - one set required per engine.
Fitment:
- 2001-2004 Chevrolet Silverado 3500 6.6L 403ci V8
- 2001-2004 GMC Sierra 2500 HD 6.6L 403ci V8
- 2001-2004 GMC Sierra 3500 6.6L 403ci V8
- 2001-2005 Chevrolet Silverado 2500 HD 6.6L 403ci V8
- 2003-2004 Chevrolet C4500 Kodiak 6.6L 403ci V8
- 2003-2004 Chevrolet C5500 Kodiak 6.6L 403ci V8
- 2003-2004 GMC C4500 Topkick 6.6L 403ci V8
- 2003-2004 GMC C5500 Topkick 6.6L 403ci V8
- 2004-2004 Chevrolet C5500 Kodiak 6.6L 403ci V8
- 2004-2006 Chevrolet Silverado 2500 HD 6.6L 403ci V8
- 2004-2006 Chevrolet Silverado 3500 6.6L 403ci V8
- 2004-2006 GMC Sierra 2500 HD 6.6L 403ci V8
- 2004-2006 GMC Sierra 3500 6.6L 403ci V8
- 2004-2007 Chevrolet C4500 Kodiak 6.6L 403ci V8
- 2004-2007 Chevrolet C5500 Kodiak 6.6L 403ci V8
- 2004-2007 GMC C4500 Topkick 6.6L 403ci V8
- 2004-2007 GMC C5500 Topkick 6.6L 403ci V8
- 2005-2005 GMC C4500 Topkick 6.6L 403ci V8
- 2007-2009 GMC C4500 Topkick 6.6L 403ci V8
- 2006-2006 Chevrolet Silverado 2500 HD 6.6L 403ci V8
- 2006-2006 Chevrolet Silverado 3500 6.6L 403ci V8
- 2006-2006 GMC Sierra 2500 HD 6.6L 403ci V8
- 2006-2006 GMC Sierra 3500 6.6L 403ci V8
- 2006-2006 Hummer H1 6.6L 400ci V8
- 2006-2007 Chevrolet Express 2500 6.6L 403ci V8
- 2006-2007 Chevrolet Express 3500 6.6L 403ci V8
- 2006-2007 GMC Savana 2500 6.6L 403ci V8
- 2006-2007 GMC Savana 3500 6.6L 403ci V8
- 2007-2007 Chevrolet Silverado 2500 HD Classic 6.6L 403ci V8
- 2007-2007 Chevrolet Silverado 3500 Classic 6.6L 403ci V8
- ...and 37 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.
