Edelbrock 54903U-904 – RHS LS Aluminum Race Block 9.240in Standard Deck 4.120in Bore 0.904in Lifter

Description

Edelbrock 54903U-904 – RHS LS Aluminum Race Block 9.240in Standard Deck 4.120in Bore 0.904in Lifter

Edelbrock® RHS® High-Performance Standard-Deck LS Engine Block

RHS LS Block, Standard 9.240″ Deck, .904 Lifter, 55mm Roller Cam Bearing (Machined Only) – Hone to 4.120″

Block Specifications: Designed from heavy-duty A357-T6 aluminum material, 4.125”-4.165” siamese cast bore walls w/ press-in spun cast iron liner, Available in standard (9.240”) & tall (9.750”) deck heights w/ beefy .750” deck thickness, Both standard deck (5.67”/5.87”- same as LS7) & tall deck (5.94”/6.38”) cylinder liner lengths available, “Long arm friendly” – Accommodations for up to 4.6” stroke w/ standard rod pin diameters (2.100”) & oversized 60mm camshaft, Main cap surface area maximized at mating surface & large fillets from cap to cross bolts for added strength, Designed for clearance – side oil galley moved outboard & engineered rod clearance come standard, Significantly increased windage passage area under bores & around caps over LS7/LSX engines, 6 head bolt design w/ full water jacket around the cylinders (based on LS7 design), Bay-to-bay breathing improved w/ increased side window area versus LSX & LS7, Extra-large windows in valley for access to inboard “6th” head bolt, Extra-long liners for standard (5.87”) & tall (6.38”) decks.

• Raised cam centerline (.388”/9.86mm) to allow larger stroke
• 2 extra links in the timing chain – Timing sets available from COMP®
• .904” lifters standard
• 6 head bolt design w/ full water jacket around the cylinders (based on LS7 design)
• RHS LS Block, Standard 9.240″ Deck, .904 Lifter, 55 Roller Cam Bearing (Machined Only)
• Rolled threads on all threaded holes for added strength
• Gen III/Gen IV compliant with race mounts for Gen I, Gen II, Gen III & Gen IV engines
• P1 MFG main stud kit standard with enough material in castings to accommodate up to a 0.5” fastener
• Chilled main bearing bulkheads for added strength
• Optimized billet main caps & improved windage

Manufacturer: RHSCylinder Quantity: 8Main Bearing Cap Bolt Quantity: 6Material: AluminumDeck Height: 9.240Grade Type: PerformanceCylinder Bore Diameter: 4.125Cam Housing Bore Diameter: 55mm roller bearing or 60 mm babbitLifter Bore Diameter: 0.904Required Products: 549401-SET or 549402-SET or 549403-SET or 549404-SET and 5496 or 5497Related Products: 70361251-8 70362501-8 70363001-8 70364001-8 70340001LUN 70840001LUN