KING Rod & Main Bearing Set for GM LS V8 4.8L/5.3L/6.0L – Standard-Size Mains & Rods

KING rod and main bearing set MB5293SI & CR807SI provides standard-size replacement bearings engineered for GM LS-series V8 engines including 4.8L, 5.3L and 6.0L displacements.

If you're rebuilding or refreshing an LS-series small-block V8, the right bearing set is essential for long-term crankshaft support and smooth rotating assembly operation. This KING kit ships with standard-size main and rod bearings compatible with a broad range of Chevrolet Vortec and LS engines—refer to your block measurements before installation. If you need an oversized option, or if KING stock is unavailable, the listing provides substitution options and a way to confirm availability before purchase.

Which engines and model years will these bearings fit?

This set fits many Chevrolet LS-family and Vortec V8s across several year ranges. It covers the 4.8L (293/294 CID), 5.3L (325 CID and later Vortec/LS4 variants), 5.7L LS1/LS6 family, and multiple 6.0L/6.2L applications including LS2, LS3 and LS9 where standard-size bearings are specified.

• 4.8L (293/294 CID): 1999–2013 Vortec platforms
• 5.3L (325 CID): 1999 & newer Vortec and LS4-compatible blocks
• 5.7L (346 CID): 1997–2005 LS1 & LS6 engines
• 6.0L/6.2L (364/365/376 CID): 1999 & newer Vortec, plus LS2, LS3 and LS9 applications where STD bearings are used

What size bearings are included and what if I need oversize bearings?

The kit contains standard-size main and rod bearings (MB5293SI STD & CR807SI STD). If your crankshaft journals have been machined or show wear, an oversize kit may be required. Contact the seller before ordering if you know you need an undersize/oversize replacement.

• Standard-size mains and rods included out of the box
• Request oversize bearings via message if regrinding was performed
• Verify journal diameters with micrometer/hone readings before installation

Are there substitute brands if KING is unavailable?

If KING inventory is temporarily exhausted we will offer equivalent A-series bearings from Clevite or ACL as a direct substitute. These alternatives meet common OE-style specifications for fatigue strength and overlay composition, but always double-check fitment.

• Substitutes: Clevite A Series or ACL A Series when KING stock is out
• Message seller to confirm current brand availability before purchase
• Substitute kits provided to avoid project delays when KING is backordered

How should I verify compatibility before installing these bearings?

Measure your crank journals and compare to factory specs to ensure standard-size bearings are correct. Inspect block clearances and consult your engine build sheet—if you’re unsure, ask for guidance from the seller or a machine shop.

• Use a micrometer to measure crank journal diameters
• Check factory service manual for bearing clearance specs
• If journals were ground, order oversize kits instead of STD

Who is this for: This KING MB5293SI & CR807SI standard bearing set is aimed at mechanics, home engine builders and restoration shops working on Chevrolet LS-series and Vortec V8s that require standard-size main and rod bearings. It’s suitable for routine rebuilds, engine swaps that keep stock crank dimensions, and anyone wanting a dependable aftermarket bearing option—if you need different clearances or an oversized set, confirm measurements and message the seller before ordering.

• Note: Standard Size Bearings will be sent.
• If you require oversizes, send a message immediately.
• If King is out of stock, we will substitute Clevite A Series or ACL Brand A Series.
• Send a message to check current stock of King.