World Products has introduced a new lightweight cast-iron small block for racing and performance applications. Weighing in at a nominal 178lb the Motown Pro Lightweight is cast from a special 40,000psi iron alloy for increased strength while weighing significantly less than typical aftermarket blocks.

The new block is available with either a standard SBC cam journal and lifters, or with a BBC cam journal and 0.904in lifter bores to provide enhanced valve train stability and performance. The priority main oiling system has been revised to accommodate the 0.904in lifter upgrade without the added cost of bronze lifter bushings. Oil passages have been enlarged and provision for oil restrictors is built into the valley, further enhancing the high rpm potential by providing improved oil supply and control. Ductile iron main caps are fitted with 4-bolt splayed caps on #2, 3 and 4 main journals and 2-bolt caps for #1 and 5 which allow easy oil pan fitment. The main caps are secured by high strength 7/16in ARP bolts for maximum stability.

Clearance for a 4.000in stroke crankshaft is provided and connecting rods, which offer clearance for the BBC cam option with the 4.000in stroke are also available. The Siamese cylinder bores are offered in either 3.995in or 4.120in (to finish at 4.000in or 4.125in) with a maximum bore of 4.185in to accommodate larger cubic inch displacement.

World’s new Motown Pro Lightweight block offers tremendous performance potential in a new lightweight package that will appeal to both circle track racers and drag racers.

Part numbers for the new SBC blocks are:

083010 – 3.995in Bore, 350 mains, standard SBC cam journal & .842 lifters

083020 – 4.120in Bore, 350 mains, standard SBC cam journal & .842 lifters

083010-BBC – 3.995in Bore, 350 mains, BBC cam journal & .904 lifters

083020-BBC – 4.120in Bore, 350 mains, BBC cam journal & .904 lifters

World Products blocks and heads are 100% American made and are subject to stringent quality assurance procedures to ensure superior quality and performance.

For more information, contact World Products, 877-630-6651, or