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Small Blocks Chevrolet |
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“The Best All-Around Small Block Chevy Replacement Block Money Can Buy!“Here, at long last, is an answer to the needs of performance enthusiasts for an alternative to searching through junkyards and swap meets for now-scarce factory 4-bolt blocks, or purchasing an aftermarket block that requires special components. World’s new “Motown“ block is 100% compatible. At first glance, one of the more noticeable differences between the World Motown and OEM Chevrolet blocks are the “bulges&rdque; at each cylinder. That’s because the “Motown&rdque; has thicker cylinder walls, and the water jackets have been expanded to provide required cooling. The Motown block can be bored to 4.200“ with a .250“ wall thickness remaining. Other physical differences between World’s Motown block and an OEM casting include creating 1“ thicker “bulkheads“ to provide ample support of the front and rear mains, and the addition of special bosses for front-feed oil systems and rear dry sump scavenging. The Motown is equipped with nodular iron main caps, precision registered with dowel pins and secured with beefy 7/16“ bolts. You should know that nodular iron caps are far superior to the OEM caps, as well as have advantages over aftermarket steel billet caps. That’s because the nodular iron will expand at the same rate as the block, promoting superior main bearing life. Another feature is the use of standard Chevrolet cam bearings throughout. No need to buy several boxes of bearings (as with other aftermarket blocks) and pick out the same-sized ones because the block isn’ step-bored. Solid pan rails are used to ensure proper sealing. Crankshafts with strokes up to 4.000“ can be used without clearancing the block. Stock-type oil pans can be used (no special wide-rail designs). The mains are align-bored. All head bolt holes are blind tapped, and the lifter bores are indexed. Most importantly, the block is manufactured in its entirety (to OS-9000 specifications) using only two fixturing operations. There’s absolutely no tolerance “stacking“ as with factory blocks, that are made on an assembly line and passed from one machine to another. back to top | |
Motown Race BlockReinforced With Billet Caps For Maximum Reliability. Perfect for “Nostalgia“ Drag Racing, Or Oval Track Spec Classes!Splayed Billet Main Caps For Competition applications where superchargers, turbos, nitrous, or ultra high compression results in extreme combustion pressures, World Products offers the Motown “race block.“ The most significant difference between the race block and its standard sibling is the use of “splayed“ steel billet 4-bolt main caps that distribute load over a larger area. Other features of the Motown race block include reinforced main webs and bulkheads, as well as substantial deck and walls.      Click on images for larger view | |
TECHNICAL SPECIFICATIONS Material: High density cast ironDeck Height: 9.025“ (standard Chevrolet) Deck Thickness: .600“ minimum Cam Bearings: Standard Chevrolet small block set Main Bearings: Standard Chevrolet (350 or 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: 4.200“ Cylinder Wall Thickness: (.250“ @ 4.200“ 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 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: Nodular iron 4-bolt (1/2“) w/dowels or splayed billet Fuel Pump: OEM mount Starter: OEM mount Motor Mounts: Dual (front and side) Cylinder Head Holes: Blind tapped to prevent leaks Weight: Approximately 190 lbs.  | |
TECH NOTE: MAIN CAP ATTACHMENTPrior to the availability of aftermarket blocks, performance enthusiasts were faced with the dilemma of scouring junkyards looking for 4-bolt main blocks or trying to fit 2-bolt blocks with aftermarket cap kits. Now you have a choice between standard 4-bolt main blocks with nodular iron caps and splayed billet caps. Rest assured that the 4-bolt setup will provide excellent reliability for most applications. But for the serious performance enthusiast, the splayed billet setup is preferred for several key reasons. The illustration below shows a cross-section of a block casting, and the relationship between bolt holes and the “meat“ of the block. As you can see, the splayed bolts have a much better “anchor“ due to available material thickness. The multi-directional clamping of the splayed bolts also helps improve bottom-end durability.    | |
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Shanons Engineering, Inc. 15487 13th Avenue South Haven, Minnesota 55382 Phone: (320) 274-5278 |
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Copyright© 1999-2006 - Shanons Engineering, Inc. Revised August 10, 2005. | |
The first thing that sets the Motown Lite block apart from others on the market are the horizontal ribs on the side of the block. Not only are they attractive, but they serve to stabilize and reinforce the cylinder walls to the point where engine builders have reported gains of 10-20 horsepower with no changes in combination other than the block. Important internal features include internal ribs that reinforce the block and serve to cross-feed lifter bores, thick bulkheads, and priority main oiling. Now here’s the best news of all-even though World’s Motown Lite incorporates so many features, it’s the least expensive aluminum block on the market today. Clearly, it’s the best value going!
