Chevy 427 LS7 Aluminum Power Adder Short Block

Chevy 427 LS7 Aluminum Power Adder Short Block

Chevy 427 LS7 Aluminum Power Adder Short Block Basic Short Shown
427 LS7 S/C
Short Blocks

New Configurations! The Perfect Short Block Foundation For The Supercharged/Turbo LS Enthusiast! Engineered For Up To 20 lbs Of Boost.

Brand New GM LS7 Aluminum Block Combined With Your Choice Of 4340 Forged Steel Crank And 4340 Forged Steel H-Beam Rods With ARP Bolts. Forged 2618 Aluminum Pistons And Premium Rings Specifically Designed For Turbo And Boost Applications Complete This High Quality Build. Every Short Block Is Machined, Balanced, Clearanced And Hand Fitted By Our Experienced Team Of Race Engine Builders.

  • Bore & Stroke
  • Compression Ratio
  • 4.125 x 4.000
  • 9.5 to 1


Supercharged / Turbo / Nitrous

Stage I

Rated For Up To 1000 HP

  • GM LS7 Aluminum Block w/6 Bolt Caps
  • GM Main Studs
  • Callies/Compstar 4340 Full Counterweight Crank (1,2,3)
  • Callies/Compstar 4340 Forged Steel Rods
  • ARP 2000 Rod Bolts
  • CP/Carillo 2618 Forged Aluminum Pistons
  • Heavy Wall Wrist Pins
  • 1.5/1.5/3.0MM Premium Ring Set
  • (Gas Nitrided Top Ring / Napier 2nd Ring)
  • Clevite 77 H-Series Main & Rod Bearings
  • Internally Balanced w/Mallory Heavy Metal
  • Professionally Blueprinted and Assembled
$ 7,995

Stage II

Rated For Up To 1200 HP

  • GM LS7 Aluminum Block w/6 Bolt Caps
  • ARP Main Studs
  • Callies/Compstar 4340 Full Counterweight Crank (1,2,3)
  • Molnar Severe Duty 4340 Forged Steel Rods
  • ARP 2000 Asymmetrical Rod Bolts
  • Diamond L2K 2618 Forged Aluminum Pistons
  • H13 Steel Wrist Pins
  • 1.5/1.5/3.0MM Premium Ring Set
  • (AP Steel Top Ring / Napier 2nd Ring)
  • Clevite 77 H-Series Main & Rod Bearings
  • Internally Balanced w/Mallory Heavy Metal
  • Professionally Blueprinted and Assembled
$ 8,795

Stage III

Rated For Up To 1500 HP

  • GM LS7 Aluminum Block w/6 Bolt Caps
  • ARP Main Studs
  • Dragonslayer 4340 Forged Steel Crank (1,2)
  • Callies Ultra-H 4340 H-Beam Steel Rods
  • Callies/ARP Ultra Bolts
  • Diamond L2K 2618 Forged Aluminum Pistons
  • H13 Steel Wrist Pins
  • 1.5/1.5/3.0MM Premium Ring Set
  • (AP Steel Top Ring / Napier 2nd Ring)
  • Clevite 77 H-Series Main & Rod Bearings
  • Internally Balanced w/Mallory Heavy Metal
  • Professionally Blueprinted and Assembled
$ 10,095
Camshaft Installation Package$750
Includes: Custom SSRE/Comp Cam Steel Billet Hydraulic Roller Cam, Cam Thrust Plate & Rollmaster Single Roller Timing Set w/IWIS Chain. Camshaft Installed and Degreed.

Custom Designed Camshaft Profile Based On Your Individual Application.
Package Options
Cloyes 9-3672TX9Z Timing Set w/Single Roller "Z" Chain and Steel Billet Sprockets $125
Deluxe Short Block Version
Includes Camshaft Package
$2195
Includes: UltraStreet Hydraulic Roller Cam, Cam Thrust Plate, Rollmaster Single Roller Timing Set w/IWIS Chain, GM Front Cover w/Seal, ATI Harmonic Balancer, Melling Hi-Performance Oil Pump, Rear Cover w/Seal and Holley Retrofit Hot Rod Pan & Pickup. Assembled With Camshaft Degreed And TDC Verified And Set
Package Options
Hi-Rev Performance Hydraulic Roller Lifters (16), Lifter Buckets (4) and Bolts (4) $395
Holley Road Race Baffle For The Retrofit Muscle Car Oil Pan add$225
GM Vehicle Specific Oil Pan $Call
Stage I Options
Blocks
Drill & Tap Block For 1/2" Head Bolt Holes. $300
ARP Main Stud Kit (Installed Before Machine Work) $295
Pistons - Pins - Rings - Bearings
Custom Compression Ratios Available $Call
Stage II Options
Blocks
Drill & Tap Block For 1/2" Head Bolt Holes. $300
Pistons - Pins - Rings - Bearings
Custom Compression Ratios Available $Call
Stage III Options
Blocks
Drill & Tap Block For 1/2" Head Bolt Holes. $300
Crankshafts
Callies Magnum 4340 Fully CCW Forged Steel Crank (58T Reluctor Wheel Standard) $550
Pistons - Pins - Rings - Bearings
Custom Compression Ratios Available $Call
Accessories
ARP Metric Head Stud Kit (15 Bolt Heads) $295
ARP 1/2" Head Stud Kit (15 Bolt Heads) $395
Cometic MLS (Multi Layered Steel) Head Gaskets (.040/.045/.051 Thickness) Each$95
Cometic MLS (Multi Layered Steel) Head Gaskets (.060/.066 Thickness) Each$115