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

The tang on a valve lock is not for holding the retainer and spring under high load. Its sole purpose is to temporarily locate the lock, retainer, and spring relative to the valve until the retainer's taper creates a 'collet' effect that binds them together.

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

When properly positioned on the valve stem, there should be a small gap between the two halves of the lock. If the halves fit together without a gap, they are too large. If they fit too loosely and leave a gap between the middle of the lock and the stem's outer diameter, they are too small.

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

These valve locks are recommended only for street applications with lighter valve spring loads. For engines with heavier valve spring loads, exceeding 1000 lbs, different valve lock designs may be necessary.

COMP Cams Valve Locks 3/8in 4 Groove 604-16

Name: COMP Cams Valve Locks 3/8in Four Groove
Brand: COMP Cams
Price: 25.31 USD
Availability: InStock

COMP Cams Valve Locks 3/8in Four Groove

$25.31

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 4 groove valve locks. Hardened steel street locks for stock engine rebuilds.

Key Features

Fits 89+ vehicle make/model combinations.
Hardened steel construction for durability.
Designed for 3/8 inch valve stems.
Features a 7-degree angle for proper retainer seating.
Includes 16 pairs of valve locks.
Recommended for street applications with lighter valve spring loads.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

COMP Cams is well-known for performance engine parts, and these 3/8 inch, four-groove valve locks are a solid option for stock engine rebuilds. They are designed to replace your original locks and are made from hardened steel for durability. It's important to match your valve locks to the valve stem size, and these are specifically made for 3/8 inch stems. They feature a 7-degree angle, which is crucial for proper seating with the valve retainer.

When installing these, pay attention to the fit. There should be a small gap between the two halves of the lock when they are correctly positioned on the valve stem. If they fit together with no gap, they are too large, and if they fit too loosely, they are too small. The tang on the valve lock's purpose is to temporarily hold the retainer and spring in place until the retainer's taper creates a collet effect, securely binding the lock and retainer together. These locks are recommended for street applications with lighter valve spring loads.

This set includes 16 pairs of valve locks, suitable for a wide range of Chrysler, Dodge, and Plymouth vehicles from the mid-70s to the mid-80s, like the Dodge D150, Chrysler LeBaron, and Plymouth Duster. Always refer to your vehicle's service manual for specific installation procedures and torque specifications.