Features

• Material: High-Density Cast iron
• Rear Main Seal: 2-piece Small Block Chevy
• Deck Height: 9.240 in. (standard LS)
• Deck Thickness: .600 in. minimum
• Cam Bearings: 55 mm Babbit cam bearing bore
• Camshaft Location: Raised .134 in.
• Lifter Bores: Bushed & Indexed
• Bore Spacing: 4.400 in.
• Bore: 4.120 in. (hone to 4.125 in.)
• Maximum Bore: 4.200 in.
• Cylinder Wall Thickness: .250 in. @ 4.200 in. bore
• Priority main oiling system
• Oil pan rails are solid stock width (can be clearanced for Strokers)
• Crank clearance for 4.000 in. stroke with H-Beam steel rods
• Nodular iron 4-bolt main caps using ARP 7/16 in. hardware with dowels 
• Main bearings for Standard 350 Small Block Chevy
• Driver Side Dipstick
• Standard Small Block Chevy OE fuel pump mount
• Standard Small Block Chevy OE starter provision
• OE Small Block Chevy integral spin-on oil filter mount
• Oil System Features: Integral boss for front feed, boss for rear scavenge, rear main cap has provisions for wet sump pump
• Accepts Small Block Chevy style motor mounts
• LS-style revers flow cooling with expanded water jackets for enhanced cooling
• Cylinder head holes are blind tapped to prevent leaks
• Weighs approximately 200 lbs.
• Includes freeze plugs, cam plug, dowel pins, and pipe plugs

Notes: 

• Water return kit 955-703849-K is required on the heads for coolant return flow to the radiator
• Adapter 955-703848-K allows SBC accessory brackets to fit
• Valley plate 955-703844-I for LS fuel injected intakes using crank trigger ignition
• Valley plate 955-703844 for LS carbureted intakes using a distributor