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Dart LS Next Engine Blocks
Dart Unleashes the Full Potential of the LS Engine Platform With the LS Next Engine Block!
The New Dart LS Next Engine Blocks are designed to eliminate the high RPM power loss and the problem of separate bays in the crankcase associated with the ''Y-Block'' design of the LS engine series. This has been accomplished by using the conventional style small and big block Chevy 4-bolt steel main caps with 7/16" bolts, full main webbing and crank barrel around a standard LS rotating assembly for maximum bottom end strength!
The cylinder barrels are extended by .375" at the bottom, providing the effective equivalent of a 9.615" deck height in terms of potential supported piston travel, while maintaining a standard 9.240" actual deck height for maximum compatibility with available components. This equates to greater piston support with long stroke combinations and allows for better piston designs to increase stability. While extra thick Siamese cylinder bores allow for large displacement capacity!
The oiling system has also been revised the stock internal main oil galley has been eliminated and a revised low restriction priority main oiling system is utilized. A pro-stock / pro-mod big block style stepped main oil galley measuring 9/16"-1/2"-7/16" is employed and increases volume but most importantly there is no loss of pressure or velocity at the front of the block!
At the top end of the block a 5/8" thick full deck design with six head bolts per cylinder is utilized to provide secure clamping strength and versatility for power adder applications. LSX style lifter bosses and guides are utilized while the provisions for oil restrictors in the lifter valley simplify the installation and removal of restrictors!
Reduced windage and increased power
Extended cylinder barrel length
Siamese cylinder bores
Special RMR Iron Alloy
4.000'' or 4.125'' w/ 4.200'' Maximum Bore
4.200'' x 4.100'' Maximum Bore & Stroke
454 Cubic Inch Maximum
Stock LS Camshaft Position
Accepts Standard Camshaft Belt Drive or Chain Drive (Cloyes p/n 9-3658TX3)
1.565'' O.D. Camshaft Snout
.275'' Cylinder Wall Thickness @ 4.185'' Bore
9.240'' Deck Height w / extended cylinder barrels .375'' at bottom
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