Home > GM Crate Engines > LS Short Blocks > Aftermarket / Race Blocks
When a stock block isn't enough, step up to an aftermarket Dart Block setup! Dart blocks feature many benefits:

  • Dart priority main oiling system with provisions for stock oil filter mounting.
  • Siamesed cylinder bores with thick walls.
  • Cylinder barrels extended .375” at the bottom of the bores.
  • Thick decks ensure reliable head gasket seal.
  • Blind head bolt holes.
  • 6 bolt per cylinder capability.
  • Scalloped water jackets increase flow around cylinders for better cooling.
  • Clearanced up to 4.100” stroke w/ steel rods.
  • Splayed outer bolts on middle main bearing caps.
  • Provisions for LSX roller lifters and cam.
  • Uses OE front and rear covers.
  • All OE bolt holes for starter, water pump, etc.
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ATK SP99-B Crate Engine
ATK SP99-B Dart SHP LS Next 388CI Boost Ready Short Block
Our Price (USD): $6,499.00
Sale Price: $6,199.00

When a stock block isn't enough, this is what you want! This shortblock is built with the perfect combination for people looking to make big power! Using all name brand components, hand built, balanced and blueprinted, its hard to be an ATK Boost Series setup! more info
ATK SP100 Crate Engine
ATK SP100 Dart SHP LS Next 441CI Short Block
Our Price (USD): $6,499.00
Sale Price: $6,199.00

When a stock block isn't enough, this is what you want! This shortblock is built with the perfect combination for people looking to make big power! Using all name brand components, hand built, balanced and blueprinted, its hard to be an ATK setup! more info
ATK SP101 Crate Engine
ATK SP101 Dart SHP LS Next 427CI NA Short Block
Our Price (USD): $6,499.00
Sale Price: $6,199.00

When a stock block isn't enough, this is what you want! This shortblock is built with the perfect combination for people looking to make big power! Using all name brand components, hand built, balanced and blueprinted, its hard to be an ATK setup! more info
ATK SP101-B Crate Engine
ATK SP101-B Dart SHP LS Next 427CI Boost Short Block
Our Price (USD): $6,499.00
Sale Price: $6,199.00

When a stock block isn't enough, this is what you want! This short block is built with the perfect combination for people looking to make big power! Using all name brand components, hand built, balanced and blueprinted, its hard to be an ATK setup!

Upgrade to a CCW Crankshaft for an additional $350.00. CCW cranks are meant for high boost/RPM applications.
more info