{"product_id":"edelbrock-rhs-ls-aluminum-race-block-part-number-54903u-ready-to-hone-9-250-inch-standard-deck-4-120-inch-bore","title":"Edelbrock RHS LS Aluminum Race Block (Part Number 54903U) — Ready to Hone, 9.250-Inch Standard Deck, 4.120-Inch Bore","description":"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”) \u0026amp; tall (9.750”) deck heights w\/ beefy .750” deck thickness; Both standard deck (5.67”\/5.87”- same as LS7) \u0026amp; 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”) \u0026amp; oversized 60mm camshaft; Main cap surface area maximized at mating surface \u0026amp; large fillets from cap to cross bolts for added strength; Designed for clearance – side oil galley moved outboard \u0026amp; engineered rod clearance come standard; Significantly increased windage passage area under bores \u0026amp; 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 \u0026amp; LS7; Extra-large windows in valley for access to inboard “6th” head bolt; Extra-long liners for standard (5.87”) \u0026amp; tall (6.38”) decks\nRHS LS Block, Standard 9.240\" Deck, .842 Lifter, 50mm Cam Bearing - Hone to 4.120\"\nBored and Ready To Hone.\n\u003cul\u003e\n  \u003cli\u003eP1 MFG main stud kit standard with enough material in castings to accommodate up to a 0.5 inch fastener\u003c\/li\u003e\n  \u003cli\u003eGen III\/Gen IV compliant with race mounts for Gen I, Gen II, Gen III \u0026amp; Gen IV engines\u003c\/li\u003e\n  \u003cli\u003eRolled threads on all threaded holes for added strength\u003c\/li\u003e\n  \u003cli\u003eChilled main bearing bulkheads for added strength\u003c\/li\u003e\n  \u003cli\u003eOptimized billet main caps \u0026amp; improved windage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Edelbrock RHS LS Aluminum Race Block (Part Number 54903U) is engineered for high-performance automotive applications, combining durability with advanced design features. Constructed from heavy-duty A357-T6 aluminum, this block offers a robust foundation for racing engines. It features a 4.125-inch to 4.165-inch siamese cast bore walls with a press-in spun cast iron liner, providing excellent durability and heat resistance. Available in standard (9.240 inches) and tall (9.750 inches) deck heights, the block accommodates a variety of engine configurations and stroke lengths up to 4.6 inches, making it highly versatile for custom builds. Both standard deck (5.67 to 5.87 inches) and tall deck (5.94 to 6.38 inches) cylinder liner lengths are available, allowing precise tailoring to your performance needs. The design includes a full water jacket around the cylinders with a six-head bolt pattern, inspired by LS7 architecture, ensuring optimal cooling and structural integrity. Enhanced side oil galley positioning and increased windage passage areas improve oil flow and reduce drag, contributing to engine longevity and efficiency. The large valley windows provide easier access to the inboard sixth head bolt, facilitating assembly and maintenance. Extra-long liners for both standard and tall decks ensure precise fitment, and the block is ready for honing, saving valuable setup time. Features such as rolled threads on all threaded holes, chilled main bearing bulkheads, and optimized billet main caps bolster strength and durability, meeting the demands of high-horsepower applications. The block is compatible with Gen III\/IV race mounts and includes provisions for up to a 0.5-inch fastener in the main studs, making it suitable for a wide range of racing builds. Please note, this product requires acknowledgment of non-CARB compliance and is not CARB approved. The Edelbrock RHS LS Aluminum Race Block is ideal for enthusiasts seeking a high-quality, reliable foundation for their custom high-performance engine projects.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eHeavy-duty A357-T6 aluminum construction for durability\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSiamese cast bore walls with press-in spun cast iron liner\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eAvailable in standard (9.240\") and tall (9.750\") deck heights\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eBeefy .750\" deck thickness for strength\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCompatible with standard and tall deck cylinder liners\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned for up to 4.6\" stroke with standard rod pin diameters\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eMaximized main cap surface area and large fillets for added strength\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eOptimized clearance with side oil galley repositioning and engineered rod clearance\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eIncreased windage passage area for improved oil flow\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSix-head bolt design with full water jacket based on LS7 architecture\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eEnhanced side window area for bay-to-bay breathing and access to sixth head bolt\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eExtra-long liners for both standard and tall decks\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eReady to hone, saving setup time\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eIncludes rolled threads, chilled main bearing bulkheads, and optimized billet main caps\u003c\/li\u003e\u003c\/ul\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbdoy\u003e\n\u003ctr\u003e\u003ctd\u003eAir Freight Prohibited: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eNot Carb Approved: true\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCarb Acknowledgement Required: true\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eLtl Freight Required: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eProp 65: Y\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003ePart Type: automotive\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eEpa: N\/A\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eRegular Stock: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eUnits Per Sku: 1\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbdoy\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":53602278277393,"sku":"54903U","price":6912.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/3830\/0689\/files\/579a38a93145e2a151cd87e6371920acL.jpg?v=1779935782","url":"https:\/\/shoprenegade.com\/products\/edelbrock-rhs-ls-aluminum-race-block-part-number-54903u-ready-to-hone-9-250-inch-standard-deck-4-120-inch-bore","provider":"Renegade Speed by Renegade Racing \u0026 Performance","version":"1.0","type":"link"}