MSD 50963 DynaForce Starter for GM LS1-LS7, Black
$519.95
An MSD DynaForce high-torque starter for GM LS1 through LS7 engines with a 168-tooth flywheel, powder coated black.
- Fits: GM LS1-LS7 engines with a 168-tooth flywheel (not GTO)
- Three horsepower: Motor sized for high-compression engines
- 4.4:1 gear reduction: Extra torque at the ring gear for strong cranking
- Ball bearings: Ball-bearing-supported armature and pinion gear
- Clockable mount: Compact housing clears most oil pans and headers; billet mount can be clocked
Amazon price as of Oct 9, 2026, subject to change. Check Amazon for the current price. Checkout is completed on Amazon, not through Planet X Performance.
The MSD DynaForce 50963 is built from all-new components around a three horsepower motor. That power runs through a 4.4:1 gear set to deliver strong torque to the ring gear, so it can crank high-compression LS engines. The armature is balanced and supported by two ball bearings. The downsized housing clears most headers and oil pans, and the billet mount can be clocked to different positions for tight installs. Finished in black powder coat.
Key specs
| Brand / part number | MSD 50963 |
|---|---|
| Horsepower | 3 HP |
| Gear reduction | 4.4:1 |
| Bearings | Ball-bearing armature and pinion gear |
| Mounting | Billet mount, clockable |
| Flywheel / flexplate | 168-tooth |
| Finish | Black powder coat |
| Weight | 11.4 lbs (confirm with the manufacturer or JEGS tech support) |
| Warranty | 90-day limited |
Fits
- Engines: GM LS1-LS7 (GM Gen III/IV LS)
- Required: 168-tooth flywheel or flexplate
- Not compatible: Pontiac GTO
In the box: Starter, shim kit, and (2) mounting bolts (per MSD’s instructions).
Check before you buy
- Tooth count: Confirm your flywheel or flexplate has 168 teeth
- Vehicle: MSD says it will not fit the Pontiac GTO
- Setup: Check pinion clearance and mesh with the supplied shims, per MSD’s instructions
Mounting hardware included.
Recommended: For replacement mounting bolts, we suggest the ICT Billet LS starter bolt kit (551681) or the ARP stainless LS starter bolt kit (430-3511).
Broken starter ear? If the outboard starter mounting ear on your LS block is cracked or broken, the Trinity Starter Bracket can repair it without machining. The block’s inboard starter bolt hole must still be intact. The Trinity can’t fix a block where the whole starter ear is missing.
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