This ACL Race Series main bearing set is sized for a standard, unmachined crankshaft main journal on the GM LS Gen III-IV 4.8/5.3/5.7/6.0L V8, built with extra oil clearance for engines running higher oil volume/pressure or looser bearing clearances (common in turbocharged, boosted, or high-RPM builds). Per ACL's own fitment data it's used across GM's full-size trucks and SUVs (Chevrolet Silverado, Suburban, Tahoe, Avalanche; GMC Sierra, Yukon; Cadillac Escalade) and GM LS-powered performance models (Corvette, GTO, Impala SS, Trailblazer SS, Saab 9-7x, Pontiac G8). Main bearings support the crankshaft in the engine block and are matched with rod bearings to control bottom-end clearances.
Specifications:
- Type: Main Bearing Set
- Series: Race Series
- Size: Standard, Extra Oil Clearance
- Engine Fitment: GM LS Gen III-IV 4.8/5.3/5.7/6.0L V8
- Part Number: 5M7298HX-STD
FAQ
What does "Extra Oil Clearance" mean?
Extra oil clearance bearings run a slightly looser clearance than standard, which some high-RPM, high-oil-volume, turbocharged, or boosted applications prefer for additional oil flow and thermal margin. Use standard clearance unless your engine builder specifies extra clearance.
What vehicles does this main bearing set fit?
It's sized for the GM LS Gen III-IV 4.8/5.3/5.7/6.0L V8, used across GM's full-size trucks and SUVs (Silverado, Sierra, Suburban, Tahoe, Yukon, Escalade, Avalanche) and LS-powered performance cars (Corvette, GTO, Impala SS, Trailblazer SS).
Do I need rod bearings too?
Yes, this listing is for main bearings only. Rod bearings for the LS Gen III-IV V8 are sold separately.
Is this a Standard size or an oversize bearing?
This is Standard size — sized for a stock, non-machined main journal — with extra oil clearance built in.
