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.

GET IT PREPPED!
For the enthusiast who is planning to assemble an engine in their home garage, getting the block in a RACE-PREPPED state is a no-brainer. Our experienced staff performs important basic operations like:
• Deck milling +/- .0025”
• Main journal honing +/- .0004”
• Cylinder bore plate honing .001” oversized +/- .0005”
• Lifter bore honing +/- .0005”
• Block hot tanking
• Cam bearing installation
• Freeze plug installation
• Dowel pin and pipe plug installation
• Block deburring
• Machined surfaces sprayed with rust inhibitor
• Protective wrapping
More and more professional engine builders are also recognizing the benefits of ordering race-prepped blocks instead of endeavoring to perform these many tasks themselves. Many have realized that their time can be better spent doing critical assembly work such as degreeing in camshafts and setting up the valve train. By employing race-prepped World blocks the shop’s through-put can be accelerated, and there are demonstrated savings in terms of personnel, shop equipment, space and cash flow.

Whether you're an enthusiast or engine builder, save time and money!

Material: 357-T6 aluminum (strongest available)
Deck Height: 9.025" (standard Chevrolet)
Deck Thickness: .600" minimum
Cam Bearings: Standard Chevrolet small block set
Main Bearings: Standard Chevrolet (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"
Cylinder Wall Thickness: Approx. .075" @ 4.155" bore
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 provisions for wet sump pump, drilled for dry sump valley scavenge lines, cross-feed lines between left and right lifter oil galleys
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) (sleeves may need notching)
Main Caps: Splayed billet steel
Mounts: OEM starter and oil filter mounts
Block: Side ribs for extra strength & cooling - cross-ribs in valley
Motor Mounts: Dual (front and side)
Cylinder Head Holes: Blind tapped to prevent leaks
Weight: Approximately 100 lbs. with sleeves