Chelhead LS Flywheel Locking Tool for GM RWD LS/LT Engines — Black Oxide 1/4" Steel, Includes Bolts

When working on GM V8 engines derived from the LS/LT family, preventing crankshaft rotation is essential for removing harmonic balancer bolts, servicing the flywheel or flexplate, and performing timing or front‑end repairs. The Chelhead tool bolts into the starter mounting location and engages the ring gear teeth, offering a simple, reliable solution without the need for specialty crank-holding fixtures. Built from cold‑rolled steel with a black oxide finish and shipped with two grade 8.8 bolts, it’s designed for workshop durability and repeat use on compatible rear‑wheel‑drive setups.

Which engines and model years will this locking tool work with?

This tool is intended for many rear‑wheel‑drive GM LS and LT engine variants produced roughly between 1997 and 2019. It fits common LS swaps and factory applications that share the starter mounting geometry and ring‑gear access.

• Compatible: LS1, LS2, LS3, LS6, LSX; 4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L
• Also fits select Gen V: LT1, LT4, L83, L86
• Covers many 1997–2019 RWD engine installations and swaps
• Not compatible with front‑wheel‑drive (FWD) engines or incompatible bellhousings

How is the tool installed and used in the workshop?

Installation is straightforward: remove the starter, align the tool over the starter bolt locations, and secure it with the supplied grade 8.8 bolts. The locking arm engages the ring gear teeth to hold the crankshaft while you apply high torque to the harmonic balancer or flywheel fasteners.

• Starter removal required for access to mounting holes
• Secures with two included grade 8.8 bolts of correct length
• Engages ring gear teeth—no extra crank holder needed
• Works on engines in chassis or mounted on stands (RWD only)

What are the construction and durability features of this flywheel holder?

Chelhead built the tool from 1/4‑inch cold‑rolled steel and secured critical joints with TIG welds for strength. A black oxide finish reduces visible corrosion and protects the surface against workshop exposure and handling wear.

• 1/4‑inch cold‑rolled steel for stiffness and longevity
• TIG welded joints to endure repeated high‑torque use
• Black oxide coating resists surface rust and scuffs
• Packaged with two proper‑length bolts for immediate use

Will this tool work on engines already installed in my vehicle or on an engine stand?

Yes — the design clears common rear‑wheel‑drive bellhousings and is intended to be usable whether the engine is in the vehicle or mounted on a stand. Always confirm starter location and engine layout before ordering to ensure fitment.

• Designed for RWD installations in engine bay or on stand
• Check starter bolt pattern and bellhousing clearance first
• Includes the two mounting bolts needed for installation
• Not suitable for FWD engines or incompatible mounting geometries

Who is this for: The Chelhead LS Flywheel Locking Tool is aimed at professional mechanics, home engine builders, and performance enthusiasts who service GM LS‑family or select Gen V LT V8s in rear‑wheel‑drive vehicles or engine stands. If you routinely remove harmonic balancers, remove or install flywheels/flexplates, or perform torque‑sensitive fastener work on these engines, this compact, steel locking tool offers a practical way to prevent crankshaft rotation while keeping your workflow efficient and secure.