4.120 in. Bore
- 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
- 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
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