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Earls Harmonic Balancer Bolt - GM LS Series - 12-Point

Harmonic Balancer Bolt w/ Thick Washer, GM LS1/LS6 4.8L-7.0L, 12-Point , 27mm Wrenching, 180,000 PSI, M16 x 2.0 x 4.330" Under Head Length. Fits all versions of the GM LS engine - except the LS7/LS9/LSA.


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Earl's harmonic balancer bolts are made from high quality chrome moly steel with 180,000 PSI rating. The extra-tall 12-point bolt head won't strip or allow the socket to slip-off when turning over the engine. Includes extra thick large diameter washer. Bolt and washer are black oxide coated.


  • 180,000 PSI Rating
  • Made from High Strength 4135 Chrome Moly
  • Black Oxide Coating
  • 27mm Wrench Size
  • Extra-Tall 12-Point Bolt Head - Won't Strip or Allow Socket to Slip Off
  • Large Diameter Extra Thick Washer
  • Reusable - Not Torque-To-Yield


Emission Code5
EngineGM Small Block Gen III/IV (LS Based)
FinishBlack Oxide
Head Style12-Point
Material4135 Chrome Moly
Product TypeHarmonic Balancer Bolts
PSI Rating180,000
Thread Size16mm x 2.0
Under Head Length4.330"
Washer IncludedYes
Washer Size.270" Thick x 1.960" Diameter
Wrench Size27mm
Part NumberDBT-004ERL



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Torque Harmonic Balancer Bolt to 235 ft-lbs. This bolt fits all versions of the LS Series engines except the LS7/LS9/LSA.


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