RHS LS Block,Std 9.240" Deck, Hone to 4.120"

Engineers at RHS® have designed a high performance aluminum engine block for GM LS applications to meet the needs of race and street performance engine builders alike. To go beyond the limitations of other existing LS blocks, the new RHS® LS Race Block is available in both standard deck and tall deck height configurations. Additionally, this innovative aluminum block features a raised cam centerline and outboard priority main oiling to allow rod clearance for a 4.600” stroke and to minimize windage in the crankcase. And for quality control assurance, RHS® conducts a CT scan (similar to a medical CAT scan) on each block to ensure maximum casting precision and consistency. When you combine unmatched finishing quality with added clearance for increased stroke applications, precision computeraided design and extra surface material to allow custom machining, you get the new benchmark for LS horsepower, torque and durability.

Features:

• Standard Deck Height (9.250)

• Needs Final Finish Hone Before Assembly

• 5.87" Cylinder Sleeve Length

• 4.120" Bore

Bock 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

• Raised cam centerline (.388”/9.86mm) to allow larger stroke; 2 extra links in the timing chain – Timing sets available from COMP®

• 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