Nissan RB30 Main & Conrod Bearings

Shop performance engine bearings for Nissan RB30 builds, including ACL Race Series main bearings and conrod bearings, Calico-coated ACL options and available King XP alternatives.

RB30 bearing selection depends on whether you are replacing the main bearings or conrod bearings, the crankshaft journal size and the oil clearance required by your engine builder. Spool Imports stocks standard-size and selected extra-clearance or undersize options across the range.

RB30 Main Bearings

RB30 main bearings support the crankshaft in the engine block. ACL Race Series main-bearing options are available for performance RB30 builds, including Calico CT-1 coated versions for builders wanting an additional dry-film lubricant coating.

RB30 Conrod Bearings

RB30 conrod or big-end bearings fit between the connecting rods and crankshaft journals. ACL Race Series and coated ACL options are available in several sizes, with King XP alternatives also listed when available.

Choosing the Correct RB30 Bearings

Do not select bearing size from the engine model alone. The crankshaft journals and assembled oil clearances should be measured during the engine build. STD, extra-clearance and undersize bearings serve different crankshaft and clearance requirements. If the crankshaft has been machined, confirm the finished journal size before ordering.

Browse the RB30 bearing range below. For other RB30 bottom-end components, see our RB30DET performance parts and RB30ET performance parts ranges.