Michigan Motorsports 7° Valve Locks 8mm Keepers — 16‑Piece Set for LS/LT Engines, Fits Beehive & Dual Springs

These Michigan Motorsports 7-degree valve locks are precision 8mm keepers engineered to secure beehive and dual-spring retainers on LS and Gen V LT engines.

If you're rebuilding a top end, installing a performance cam, or swapping heads on an LS/LT platform, reliable valve locks are essential. Michigan Motorsports designed these 7° keepers (Part #Ai141-32) to fit a wide range of GM small-block derivatives and Gen V LT variants, offering consistent retention for 8mm valve stems across popular retainers from BTR, TSP, PAC and OEM suppliers.

Will these 7° keepers fit my LS or LT engine?

Yes — they are built specifically for 8mm valve stems and tailored to common GM small-block dimensions. This set covers most LS-series and Gen V LT engines, so long as the valves use the 7-degree seating angle and 8mm stems.

• Compatible engines: LS1, LS2, LS3, LQ4, LQ9, L83, L86 and other 4.8L–7.0L platforms.
• Designed for 7-degree valve angles and 8mm stems for correct seating.
• Works with factory and popular aftermarket retainers without machining.

Can these keepers be used with beehive and dual spring setups?

They are compatible with both beehive and dual-spring retainers, making them a flexible choice for many builds. Whether your setup uses lightweight beehive springs or higher-rate dual coils, these keepers provide a secure mechanical lock between retainer and valve stem.

• Tested with BTR, TSP and PAC retainers as well as OEM pieces.
• Suitable for stock to high-RPM applications when paired with correct springs and retainers.
• Full set supplied for all 16 valves for a complete top-end job.

How durable are these keepers under performance conditions?

Manufactured from high-strength materials, these Michigan Motorsports keepers are made to resist wear and deformation from repeated high-RPM cycling. They are intended for long-term valvetrain retention when installed and used with appropriate components and clearances.

• Precision-machined surfaces for reliable engagement with valve stems and retainers.
• Heat- and fatigue-resistant metallurgy suited to performance engines.
• Quality control ensures uniform fit to minimize loosening or slippage risk.

What comes in the package and do I need additional parts?

The kit includes a complete set of 7-degree keepers sufficient for 16 valves, ready to install in a typical V8 top-end refresh. You’ll need compatible retainers and springs (beehive or dual) and standard valve installation tools; no special machining is usually required if your valves and retainers match the 7°/8mm spec.

• Complete 16-piece keeper set for full V8 valve coverage.
• Compatible with many aftermarket retainers—verify retainer spec before fitting.
• Installation typically requires a valve spring compressor and clean valve stems.

Who is this for? These 7° Michigan Motorsports valve locks are aimed at enthusiasts, engine builders and performance shops working on LS-series and Gen V LT small-block GM engines. They suit anyone upgrading cams, performing head swaps, or completing a top-end rebuild who needs a dependable, aftermarket keeper solution compatible with beehive or dual-spring retainers. If your application uses 8mm valve stems and 7-degree retainers, this kit provides a straightforward, durable solution to secure your valvetrain.