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08-10 STI Performance Crankshafts

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Manley Turbo Tuff Billet 4340 Subaru crankshafts are the perfect crank to complete a stout bottom end build. Each crankshaft is put through a multi-step heat treatment process and nitrided (hardened) for maximum strength. The crankshaft is then stress relieved, shot peened, and magnafluxed (stress tested). The center, crank pin and counterweights are gun drilled for reduced weight. Each Turbo Tuff crankshaft features knife-edged counterweights for proper balance and lowest rotational mass.

  • Specs:
  • 4340 Billet For High Horsepower/High Boosted Applications
  • Multi-step heat treatment process
  • Nitrided, Stress Relieved and Shot Peened
  • 100% Magnafluxed
  • Knife-edged counterweights
  • Gun drilled crank pin and counterweights
  • Subaru STI 2008-2010
Description Part # MSRP Price Inventory  
79mm Stroke / 19.5 lbs Turbo Tuff Crankshaft 190040B $2,000.00 $1,552.00 2 available
EJ20/EJ25 - 83mm Stroke / 21 lbs Turbo Tuff Crankshaft 190060B $2,000.00 $1,552.00 Ships from factory in 2-3 days
EJ20/EJ25 - 75mm Stroke / 19.5 lbs Turbo Tuff Crankshaft 190160B $2,000.00 $1,552.00 1 available
K1 Technologies Performance Crankshafts

It is no secret that K1 Technologies has the innovation and resources bring you some of the best performance crankshafts available on the market today. All K1 crankshafts are 4340 steel, core hardened and tempered to reduce stress and optimize tensile strength. K1 Technologies crankshafts are made with a nitriding process for optimal hardening, designed to prevent softening between the journals and eventual deformation. K1 crankshafts also feature straight oil holes for more efficient rod journal oiling. Each K1 crankshaft is magnetic particle inspected and held to a maximum tolerance of .0002in journal dimension. Counterweights are placed for optimal load reduction and ease of balancing. K1 Technologies connecting rods are quality built from billet 4340 steel for superior strength in high horsepower applications. K1 has also called upon the experts at ARP fasteners to design special K1 proprietary rod bolts with asymmetrical threads to equally load each thread when under pressure. K1 rods are shot peened for improved fatigue life and are finished in the USA using only state of the art Sunnen hones. K1 rod housing bore tolerances of +/- .000050in (50 millionths) match some of the tightest accepted tolerances in the industry. All K1 rod sets are weight-matched to +/- 1 gram and boxed with the individual rotating, reciprocating, and total weights conveniently noted for balancing. A special wrist pin bushing material is also used with these assemblies offering optimal friction reduction.

  • Note:
  • Includes main and rod journals
  • Subaru STI 2008-2010
Description Part # MSRP Price Inventory  
K1 Crankshaft, 75mm Stroke, 21lbs 038ADD750 $1,425.60 $1,425.60 Usually ships in 7-10 days
K1 Crankshaft, 79mm Stroke, 21lbs 039ADD790 $1,425.60 $1,425.60 Usually ships in 7-10 days
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© 2017 JSC Speed Inc.  All Rights Reserved.
1635 Bustleton Pike, Suite B, Feasterville, PA 19053
Tel: 215.489.2820
Mon-Fri 8am-6pm

©2017 JSC Speed Inc.
All Rights Reserved.

1635 Bustleton Pike,
Suite B
Feasterville, PA

Tel: 215.489.2820