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Extreme 1500 Package

Extreme 1500 Package

$31,295.00Price

1500 HP Capable — Extreme 1500 Package

Extreme Boost. Reinforced Structure. Competition Proven.


From $31,295


The Extreme 1500 Package is a fully forged, high-boost Barra long engine engineered for dedicated pro street, strip and competitive roll-racing applications targeting 1500 horsepower capability and beyond.


This package features a custom forged bottom end with upgraded heavy-duty piston pins, high-strength I-beam connecting rods, race-grade coated bearings, reinforced main stud hardware and billet girdle support. The block undergoes full machining preparation including decking, precision boring and honing, timing cover and sump preparation, and is further strengthened with a 3/4 grout fill and fire-ring sealing system to maintain stability under extreme cylinder pressure.


The rotating assembly is upgraded to Torrington bearing specification with line honing, crank machining, end-float verification and full dynamic balancing to ensure reliability at sustained high RPM and boost levels.


The cylinder head receives a complete overhaul with porting, upgraded valves, performance valve springs with lightweight retainers and precision assembly. A high-performance camshaft package, reinforced timing system and VCT delete configuration complete a top-end engineered for maximum airflow and boost control.


Each engine is assembled and blueprinted in-house with strict clearance verification, ring gap setting for high-boost applications and documented build procedures to ensure durability in extreme conditions.


Built for extreme boost. Constructed for unparalleled strength. Ready for competition.


Bottom End Components

  • Custom CP Bullet Pistons

  • 250 piston pin upgrade

  • Spool Drag-Beam Rods with L19 ARP Cap Bolts

  • ACL Race Main Bearings – 360° (Calico Coated)

  • ACL Race Conrod Bearings (Calico Coated)

  • ARP Main Studs

  • Atomic 10mm Main Girdle

  • ARP 625 Head Stud Kit

Block Reinforcement & Sealing

  • Fire-ring block and head machining

  • Copper head gasket

  • 3/4 grout fill

Valvetrain & Head Components

  • Kelford C-Barra Camshafts

  • Kelford Valve Springs with Titanium Retainers

  • Oversized stainless intake & exhaust valve set

  • Full ported cylinder head

  • Upgraded valves

Timing & Ancillaries

  • Atomic Timing Chain Kit

  • Genuine timing tensioner

  • Atomic Vernier Gears (VCT delete)

  • Atomic VCT Blank Kit with Billet Plugs

  • Water pump with metal pulley

Oiling & Rotating Assembly

  • Torrington bearing conversion

  • Balance rotating assembly

  • Atomic Steel Oil Pump

  • Ross Racing Gold Harmonic Balancer

  • ARP Harmonic Balancer Bolt

  • Crow Anti Pump-Up Barra Lifter Set

  • Rear main seal

  • Custom 2-pack painted engine covers

Machining & Preparation

  • Hot wash and acid bath block

  • Replace welch plugs

  • Deck block

  • Bore and hone 6 cylinders (.10 thou over STD)

  • Paint block

  • Hot wash and sand blast timing cover

  • Hot wash and sand blast sump

  • Prepare caps for line honing

  • Fit stud kit & girdle for line hone

  • Line hone main tunnels (6 cyl petrol)

  • Machine crank to suit Torrington bearing

  • Fit crank and verify end float

  • Fire-ring machine block and head

  • 3/4 grout fill block

  • Full cylinder head overhaul:

    • Hot wash

    • Sand blast

    • Acid clean

    • Dismantle valve train

    • Lap and seat valves

    • Deck head

    • Assemble valve train

    • Port cylinder head

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