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Dart LS NEXT Cast Iron Block, Each

Priority main oiling system.
Available in 4.000 and 4.125 Bore
Available in 9.240 Stock Deck and 9.450 Tall Deck
Siamesed cylinder bores with extra thick walls.
Cylinder barrels extended .375” at the bottom.
Extra thick decks ensure reliable head gasket seal.
Blind head bolt holes don’t go through to water jacket.
Scalloped water jackets increase flow around cylinders for better cooling.
Clearance for 4.100” stroke w/ steel rods.
Splayed outer bolts on Center main bearing caps.
LS or Gen I style motor mounts.
Provisions for OE stock roller lifters and cam in stock location.
Uses stock timing covers and stock rear cover.
All OE bolt holes for starter, water pump, etc.
Driver or passenger side starter mounts.
Please Call for Availability


Designed from a clean slate approach the LS Next Iron block has addressed the shortcomings of the LS platform and is the ideal candidate for hot rodders, drag racers, circle track competitors, off-roaders, and high performance marine enthusiasts. Available in a Stock Deck high of 9.240 and a tall deck version of 9.450, also the Head bolts have been upgraded to a 7/16" for extra strength.

The LS NEXT block utilizing conventional style main caps with LS rotating assemblies and related components, Dart has addressed the windage and oil control problems which result from the factory LS engine’s separated crankcase bays. Conventional style 4-bolt steel main caps with 7/16” bolts are used

Dart’s LS Next block is cast in the USA with premium cast iron alloy, 6 head bolts per cylinder provide secure clamping for power adders or high Compression race applications. The cylinder barrels are extended by .375” at the bottom, providing greater piston support and stability for all combination.


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