Michigan Motorsports 7° Valve Locks 8mm Keepers — 16‑Piece Set for LS/LT Engines, High‑Strength Retention

Michigan Motorsports 7-degree valve locks are precision 8mm keepers designed to securely retain beehive and dual valve spring setups on LS and Gen V LT engines.

If you're refreshing a top end, installing a performance cam, or swapping heads on an LS/LT platform, the right valve locks are essential for reliable valvetrain operation. These 7° keepers (Part #Ai141-32) are made to fit 8mm stems and are compatible with a wide range of retainers from PAC, BTR, TSP and OEM designs. Built from high-strength material, they provide the retention geometry needed for high-RPM builds while covering many popular GM V8 displacements.

Will these keepers fit my LS/LT engine and retainers?

Yes—these valve locks are engineered for 7-degree valve seats and 8mm valve stems, making them compatible across many LS-series and Gen V LT engines. They work with both beehive and dual spring retainers, and are specified to pair with PAC, BTR, TSP or OEM retainers that accept 7° keepers.

• Compatible engines: LS1, LS2, LS3, LQ4, LQ9, L83, L86 and other 4.8L–7.0L LS/LT platforms.
• Spring types supported: beehive retainers and dual spring retainers.
• Retainer brands: PAC, BTR, TSP, OEM-style designs.
• Stem size: designed for 8mm valve stems with 7° keeper seats.

How do these 7° keepers perform at high RPM and under stress?

These keepers are manufactured from durable, high-strength material and machined for consistent geometry, minimizing lift-off or slippage under high-RPM operation. Properly installed with the correct retainers and springs, they maintain secure valve retention during aggressive cam profiles and sustained racing or street performance use.

• High-strength construction resists deformation under load.
• Precision machining ensures uniform seat alignment on all valves.
• Designed to work with heavy spring pressures and dual-spring setups.
• Reduces risk of valve separation when matched to correct components.

What is included and what should I check before installation?

The package contains a complete set of 7-degree keepers sized for all 16 valves so you're ready to perform a full top-end rebuild or upgrade. Before installation, confirm your valve stems are 8mm and your retainers specify 7° keepers; inspect springs, retainers and seals for wear and verify spring heights and pressures meet your cam and engine builder recommendations.

• Includes full set for 16 valves (complete engine coverage).
• Verify valve stem diameter (8mm) and retainer compatibility (7° seat).
• Check spring condition, installed heights, and recommended pressures.
• Use correct assembly lube and follow torque/procedure for your heads.

Can these keepers be used in performance builds or only OEM replacements?

They are suitable for both OEM-style replacements and performance-oriented builds. Their compatibility with beehive and dual spring retainers and their robust construction make them a flexible choice for stock rebuilds, upgraded valvetrain packages, or high-RPM camshaft applications.

• Stock rebuilds: direct-fit replacement for worn or lost keepers.
• Performance builds: supports aggressive cams and higher spring pressures.
• Head swaps: aids installation when changing retainers or springs.
• Cam upgrades: provides reliable retention for extreme lift events.

Who is this for: The Michigan Motorsports 7-degree valve locks are aimed at engine builders, performance enthusiasts, and professional shops working on GM LS and Gen V LT V8s who need a dependable, vehicle-spanning keeper solution. Choose these keepers when you require 8mm, 7° retention geometry that fits beehive and dual-spring retainers from PAC, BTR, TSP or OEM sources, whether you’re doing routine maintenance, a complete top-end refresh, or building a high-RPM performance engine.