Spool GM LS V8 Billet 4340 Full Counterweight 4" Stroke Crankshaft
Spool GM LS V8 Billet 4340 Full Counterweight 4" Stroke Crankshaft
Spool Full Billet 4340 Full Counterweight LS 4" Stroke Crankshaft
The Spool 4.000” stroke LS crankshaft is manufactured from 4340 billet steel, providing exceptional strength and durability for high-performance applications. Designed with full counterweights, this crankshaft improves rotational balance, reduces crankshaft flex, and enhances main bearing longevity under high RPM and extreme loads.
Key specifications:
- Material: 4340 Billet Steel
- Stroke: 4.000”
- Counterweight Design: Full counterweight for improved balance and reduced stress
- Main Journal Size: Standard LS
- Rod Journal Size: Standard LS
This crankshaft is precision-machined and finished to exact tolerances, making it suitable for high-horsepower street, drag racing, and endurance applications.
Note: Crank does not come with reluctor
Note: Clearancing of a stock cylinder block to make space for the counterweights is required.
Available options
- Reluctor Wheel Option: No Reluctor wheel; Genuine GM LS 24 tooth Reluctor Wheel; Genuine GM LS 58 tooth Reluctor Wheel
Engine build fitment
GM / LS|LS 5.7L and 6.0L V8. Match the selected dimensions, engine generation and rotating assembly specification before machining or assembly.
Installation and BBT workshop support
Measure journal and thrust clearances, check block clearance and balance the complete rotating assembly. Confirm the damper, crank trigger and flywheel arrangement with your engine builder.
Built by Boost & Tune is an authorised Spool Imports dealer and can assist with component selection, engine assembly and tuning requirements for your build.
Related supporting parts
Confirm the supporting part matches your selected build specification.