Mahle / Clevite CB663A
Connecting rod bearings for Chevrolet Small Block and selected LS engines. STD or undersize variants correspond to the rod journal size.
Mahle / Clevite CB663A is a connecting rod bearing used in many Chevrolet Small Block / SBC and selected LS engines. It is designed for crankshaft service, short-block assembly and correct rod bearing oil-clearance setup.
Application / fitment
These bearings are used in selected Chevrolet V8 engines, including Small Block Chevy and LS families, when the crankshaft and connecting rods require the CB663A bearing type. The selected size variant corresponds to the rod journal diameter and crankshaft machining size.
- Chevrolet Small Block / SBC: 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400 CID
- Chevrolet LS Gen III/IV, selected 4.8 / 5.3 / 5.7 / 6.0 / 6.2 / 7.0 engines
These bearings may also be used in selected Mercury 3.0L marine engines when the CB663A part number, STD/undersize size, rod journal diameter and required bearing clearance match.
Before assembly, check the rod journal diameter, crankshaft undersize, bearing width and required bearing clearance.
Technical information
- Part type: connecting rod bearings
- Engine family: Chevrolet Small Block / SBC and selected LS engines
- Size: STD or undersize variant depending on crankshaft machining
- Technical selection: rod journal size