RHS / Edelbrock LS3 Aluminium Race Engine Cylinder Block Standard Deck 4.125" Bore

LS3 Aluminum Race Block Standard Deck 4.125 Bore

RHS LS Bare Race Blocks - now under the name of Comp Cams. 

These RHS LS bare race blocks are designed for high performance engine builders and racing enthusiasts. This light weight LS Aluminium blocks is a standard deck height, allwoing you to bolt on your existing heads, manifolds, Extractors etc. These blocks are alos made for maximum crankshaft clearance around a 4.600 in. stroke crankshaft. With their unique design, RHS engineers were able to minimize windage in the rotating stroker assembly, a great advantage with high rpm.

These aftermarket aluminum LS blocks also have both factory and motor plate race mounts for Gen I, II, III, and IV engines. RHS LS bare race blocks each receive a CT scan to ensure maximum performance and consistency.

Standard features include:

* Designed from aircraft-quality A357-T6 aluminum
* Siamese cast bore walls (4.125 in. or 4.165 in. diameter) with press-in cast iron sleeves
* Machined with 55mm cam bearing journal
* Available in standard (9.240 in.) and tall (9.750 in.) deck heights with beefy deck thicknesses (.500 in. standard/.750 in. tall deck); standard (5.87 in.) and tall (6.38 in.) deck cylinder sleeves are available
* 6 head bolt design with full water jacket around the cylinders' walls; large windows in the valley allow access to an inboard 6th head bolt
* Block design includes large front and rear AN-12 side feeds for serious dry sump setups
* Material for oversized lifters with lifter bosses that are designed to clear tie bar style lifters

Comp Cams / RHS LS Cylinder Block 54903U Specs:

• Engine Family: Chevy LS
• Engine Block Style: OEM style mountig points - racing applications. 
• Engine Block Material: Aluminium A-357
• Bore Size: Shipped with 4.115" will require final hone to finish. 
• Maximum Bore Size: 4.165"
• Deck Height: 9.240"  (standard LS deck height)
• Weight: 140 lbs / 64 Kg
• Mains Bolts - Yes 6 Bolt mains
• Main Caps - Billet steel
• Camshaft Location:
• Freeze Plugs: included 
• Country of manufacture: USA