Holden / GM LS1,LS2 LS3 - 4.00" Extreme Boost Engine Kit - 2,000hp+

Extreme Boosted 2,000hp+ LS Engine Rotating Assembly Kit

Take your LS build to the next level with our Extreme Boosted LS Engine Kit – engineered for serious horsepower and maximum reliability under extreme boost pressures.

This premium kit includes:

✅ Full Counterweight Billet 4” Crankshaft

• Machined from solid billet steel (not forged) for unmatched grain alignment, strength, and durability

• Designed to handle extreme cylinder pressures found in big boost applications

• Note: A stock block will require clearancing to make space for the counterweights

✅ X300 Conrods (Set of 8)

• Made from ultra-high strength 300M material

• Engineered for extreme boost builds with massive 7/16” ARP2000 bolts standard (optional upgrade to ARP L19 available)

• Perfect for turbo, supercharged, and nitrous LS engines pushing beyond 1,500hp

✅ CP Bullet Power Adder Pistons (Set of 8)

• Designed specifically for boosted applications including turbocharged, supercharged, and nitrous engines

• Features thicker crowns, reinforced pin bosses, and superior alloy construction for maximum reliability

• Try our new LS Piston Finder to help select the right piston. Click here

✅ Athena Cut Ring Head Gaskets (Pair)

• The ultimate combustion sealing solution for extreme boost

• Stainless steel rings bite into the head for a secure seal, preventing head lift and blown gaskets under extreme pressure

Why Choose This Kit?

If you’re building a street monster, drag car, or record-chasing dyno engine, this kit provides the foundation you need to make big power safely and reliably. All components are carefully selected to work together for maximum performance and durability.

Piston options and specifications

Piston selection: Match the measured block bore, stroke, 6.125-inch rod and actual cylinder-head geometry. Large-bore options require a suitable block and matching head-gasket bore. AFR/Brodix 12-degree options, where listed, require those specific heads. BLSR Race options use 1.2/1.2/3.0mm rings and carry the displayed upgrade charge; use the matching supplied ring set. Compression ratios are reference figures and depend on the complete engine combination.

Confirm the piston crown, ring package, pin specification, fuel, boost and operating clearances with your engine builder for the intended power level. The kit power description is not a rating for every selectable piston combination.