Spool GM LS V8 4. Stroker Kit with Full Billet, Full Counterweight Crankshaft
Holden / GM LS1,LS2 LS3 - 4.00" Extreme Boost Engine Kit - 2,000hp+
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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
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Machined from solid billet steel (not forged) for unmatched grain alignment, strength, and durability
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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)
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Made from ultra-high strength 300M material
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Engineered for extreme boost builds with massive 7/16” ARP2000 bolts standard (optional upgrade to ARP L19 available)
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Perfect for turbo, supercharged, and nitrous LS engines pushing beyond 1,500hp
✅ CP Bullet Power Adder Pistons (Set of 8)
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Designed specifically for boosted applications including turbocharged, supercharged, and nitrous engines
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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)
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The ultimate combustion sealing solution for extreme boost
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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.
| Product Name | Holden / GM LS1,LS2 LS3 - 4.00" Extreme Boost Engine Kit - 2,000hp+ |
|---|---|
| Brands | Spool |
| Engine | GM / LS |
| Make | Chevrolet, GM, Holden, LS Chev |
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
Shipping calculations available at checkout.
If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
What is included in a typical Spool engine kit?
Kits usually include pistons, rings, rods, bearings and related hardware depending on the engine family. Check the listing for exact inclusions.
Do I still need machining with a full engine kit?
Yes. The block must be honed and all clearances checked and set by your builder. Assembly should only occur after full measurement and verification.
What machining is required for the full counterweight billet crankshaft in the SPL-LS-4-000-XTR-CP-REB kit?
The full counterweight billet crankshaft will require clearancing of the stock block to accommodate the counterweights. Ensure this is done carefully to maintain structural integrity.
What are the recommended torque specifications for the ARP2000 bolts used in the X300 conrods?
For the 7/16” ARP2000 bolts, the recommended torque specification is around 75 ft-lb when using ARP Ultra-Torque lubricant. Always refer to ARP's latest instructions for the most accurate guidance.
What bore clearance and ring gap should I set for the CP Bullet Power Adder pistons?
Bore clearance and ring gaps for the CP Bullet Power Adder pistons should be determined by the engine builder based on the specific application and boost levels. Typical clearances for boosted applications are generally tighter than naturally aspirated setups.
How do the Athena cut ring head gaskets perform under extreme boost conditions?
The Athena cut ring head gaskets are designed to provide superior sealing under extreme boost, utilising stainless steel rings that bite into the head. This helps prevent head lift and blown gaskets, making them ideal for high-performance applications.
Can I use this kit for applications beyond 2,000hp?
While the SPL-LS-4-000-XTR-CP-REB kit is rated for 2,000hp+, its reliability at higher power levels will depend on proper machining, clearances, tuning, fuel quality, and boost levels. Always consult with an experienced engine builder for specific applications.
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GM High pressure pump Kit with both O rings and PUG001 GirdleSpecial Price AUD$222.73 Regular Price AUD$225.45 -
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