From any angle, this aluminum block is the class of the SBC field. The exclusive horizontal ribs that set the MOTOWN apart from all others serve several important functions, such as stabilizing and reinforcing the cylinder walls and enhancing cooling. They look cool too.

There are also reinforcing ribs in the valley that connect the banks and add stability to the lifter bores. The ribs are drilled to cross-feed the lifter galleys. What’s more, the block is configured for priority main oiling to assure that the crankshaft is lubricated before the lifters.

Material: 357-T6 Aluminum (strongest available)
Deck Height: 9.025" (standard Chevrolet)
Deck Thickness: .600" minimum
Cam Bearings: Std small block set • Can be machined for 50MM.
Main Bearings: Std Chevrolet (350/400 style)
Camshaft Location: Stock
Lifter Bores: Indexed (stock .843" bore)
Bore: 3.990" (hone to 4.000") or 4.115" (hone to 4.125")
Maximum Bore: 4.155"
Water Jackets: Expanded for better cooling
Lubrication: Priority main oiling system
Oil System Features: Integral boss for front feed, boss for rear scavenge, rear main cap has provision for wet sump pump
Filtration: Integral mount for spin-on filter
Oil Pan Rails: Solid (stock width) can be clearanced for strokers
Crank Clearance: 4.000" stroke (H-beam steel rods)
Main Caps: 4-bolt Splayed Billet
Main Cap Design: All 5 Caps are 4 Bolt Design w/ center 3 splayed outer bolts
Main Cap Locators: Stock Register & 2 Ring Dowels at the 2 center studs
Main Cap Hardware: ARP ½” Stud Kit
Rear Main Seal: Two piece SB Chevy
Fuel Pump: OEM mount
Starter: OEM mount
Motor Mounts: Dual (front and side)
Cylinder Head Stud/Bolt Holes: Blind tapped to prevent leaks
Weight: Aluminum approx 100lbs. W / Sleeves.