ATK HPE388B Dart LS Next Boost 388CI 1500HP Rated Long Block



1 in stock (can be backordered)|Lead Time: Estimated: 4 - 6 weeks

SKU: HPE388B Categories: ,


ATK’s new Elite Series LS Long Blocks are a step of above the rest. Every engine is a well thought out parts combination that is purpose built for each application. All of our Elite Series long blocks are fully machined, blueprinted and dyno tested to ensure quality prior to shipping. This engine with a stock LS3 Intake and Throttle Body with Twin 62mm turbos @ 18PSI made over 1200RWHP / 950RWTQ in a Cadillac CTS-V! It has the potential to make 1300RWHP+ turned up!

Engine Specifications:
• HP: 645 (Naturally Aspirated)
• TQ: 540 (Naturally Aspirated)
• Block: Dart SHP LS Next Cast Iron
• Bore/Stroke: 4.125″ x 3.622″
• Displacement ( 388
• Crankshaft: Manley Dart Billet 3.622″ Stroke Internally Balanced 58 Tooth 6 Bolt
• Rods: Manley H Tuff H Beams 4340 Forged 6.125″ ARP 2000 Bolts
• Pistons: JE Ultra Flat Top 2618 Forged with Thermal Coating, Lateral Gas Ports, .200″ Pin
• Compression Ratio: 10:1
• Rings: JE Pro Seal with Carbon Steel Top Ring
• Camshaft: Hyd. roller
• Cam Specs: Custom ATK Grind
• Cylinder Heads: Frankenstein M311 72cc/273cc with Black Nitride Stainless Steel Severe Duty Valves, Titanium Retainers and PAC .700″ lift Springs
• Head Fasteners: ARP Head Studs
• Head Gaskets: Cometic MLX
• Lifters: Johnson 2116LSR Link Bar
• Rocker Arms: OE powdered metal 1.7 ratio with Trunnion Upgrade
• Oil Pump: Melling 10295 Standard Volume High Pressure

Recommended Components:
• Oil- 20W50
• Oil Filter: Wix
• Fuel System – OE EFI System or Aftermarket
• Intake – Stock Fuel Injected or Aftermarket
• Balancer- SFI Internally Balanced
• Flex plate/Flywheel- Stock Internally Balanced
• Timing- Set to Factory Specifications Via PCM Module (Tune Required)
• Spark Plug: NGK BR7
• Tuning: Chassis dyno tune required
• Firing Order- Stock
• Fuel – 91+ Octane
• Recommended Stall Converter- 2800+ based on application
• Headers- 1 7/8”+ depending on application

Notes: This engine is built to handle up to 25PSI of Boost from either a Turbo or Super Charger.


  • Dart LS Next SHP Skirted Block – The Dart block features a full skirt design with a priority main oiling system, steel four bolt main caps and is setup to run a 4 or 6 bolt cylinder head.
  • Dart BILLET Crankshaft – The Dart Billet crankshafts are proven to handle over 2000HP and outfitted with Center Counter Weights. The CCW not only add material and strength to the center of the crank, but they also add balance and stability that counters the jump rope effect under high RPM and increased power.
  • Manley H Tuff H Beam Connecting Rods – Manley’s H Tuff Rods have become the benchmark for fully machined high end connecting rods in the performance industry. These Rods include double-ribbed pin surround and increased cross sectional thickness in critical areas; for a connecting rod that will handle higher boost and horsepower levels than a standard H Beam Rod.
  • JE Ultra Series Pistons – The Ultra line combines all the best, most desirable piston features, such as thermal barrier crown coating, lateral gas ports, thick – wall wrist pins and a new forging technology for the ultimate strength. They are specifically designed for Massive Power and Boost right out of the box.
  • JE Pro Steel Rings – The JE Pro Steel Rings are designed to maximize horsepower through precision sealing of combustion pressure. This ring pack will have a carbon steel top ring for high boost applications.
  • Clevite H Bearings – These bearings were primarily developed for Nascar racing, but are well suited for High Performance applications as well. They’re especially good for high revving engines and getting the exact clearances needed with consistency.
  • Frankenstein M311 – The Monster Series is the first threshold into HP creation far beyond any OEM head. Frankenstein introduced another level of horsepower when The Monster was brought to life. FED poured our arsenal of precision engineering into a common cylinder head and woke the industry. Intake and exhaust chambers are 5-Axis CNC ported with our latest high-performance program, meticulously hand blended and deburred. Our strict quality control processes ensure extreme attention to detail and precise tolerances. High quality components include FED’s premier stainless steel sever duty valves, custom PAC .700″ lift valve springs, titanium retainers, bronze guedes and hi temp silicone exhaust o-ring gaskets.
  • Johnson Link Bar Lifters – 100% American made, Johnson leads the way in quality and performance when it comes to lifters.
  • ARP Head Studs – For ultimate clamping force under high boost!
  • Suitable for a Supercharger, Single or Twin Turbo applications!
  • Upgrades and Custom Builds Available.


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