How do I know if these valve locks are the correct size for my application?

When properly installed, there should be a small gap between the two halves of the valve lock. If the halves fit together tightly without a gap, they are too large. If they fit snugly to the stem but leave a gap between the middle of the lock and the outer diameter of the stem, they are too small.

What is the purpose of the tang on a valve lock?

The tang's primary role is to temporarily position the valve lock, retainer, and spring relative to the valve stem. The main holding force comes from the retainer's taper creating a 'collet' effect around the lock as spring pressure increases.

Are these valve locks suitable for high-performance engines with heavy valve springs?

These locks are recommended for street applications with lighter valve spring loads. For engines with very high spring pressures, exceeding 1000 lbs, it's advisable to consult manufacturer specifications for heavy-duty valve train components.

COMP Cams 7 Degree Valve Locks 3/8in 4 Groove | 604-12

Name: COMP Cams Valve Locks 3/8in Four Groove
Brand: COMP Cams
Price: 17.95 USD
Availability: InStock

COMP Cams Valve Locks 3/8in Four Groove

$17.95

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams 3/8in four groove valve locks are a well-built replacement for stock engine rebuilds, suitable for street applications.

Key Features

Fits many Chrysler and Dodge vehicles from the 1960s through the 1980s.
Designed for 3/8 inch valve stems and 7-degree retainers.
Hardened steel construction for durability in street applications.
Four-groove design for secure retainer engagement.
Recommended for stock engine rebuilds with lighter valve spring loads.
Includes 12 pairs of valve locks.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

If you're rebuilding the top end of a Chrysler or Dodge engine, getting the valve train components right is key. These COMP Cams valve locks are designed to work with 3/8 inch valve stems and a 7-degree retainer angle, making them a solid option for stock engine rebuilds. They are specifically recommended for street applications where valve spring loads aren't excessively high.

These locks are made from hardened steel and feature a four-groove design. It's important to ensure the locks fit correctly; there should be a small gap between the two halves when properly seated on the valve stem. If they fit together without a gap, they're too large, and if they leave a gap between the middle of the lock and the stem's outer diameter, they're too small. The tang on the lock's purpose is to temporarily position the components until the retainer's taper creates a secure 'collet' effect, which actually holds everything in place under spring pressure.

This set includes 12 pairs of valve locks, enough for a typical V8 engine. They are a direct replacement for many Chrysler and Dodge vehicles from the 1960s through the 1980s.