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SKU:
NLT1H00512
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GM Gen III IV LS Valve Spring Compressor Tool
$24.99
In Stock
$24.99
Sale price
$24.99
Regular price
This new aftermarket on-head valve-spring compressor fits compatible GM Gen III and Gen IV LS-based engines including LS1, LS2, LS3, LS6, LS7, LS9, and LQ4.
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I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- GM Gen III LS1 and LS6
- GM Gen IV LS2 and LS3
- GM LS7, LSA, LS9, L92 and related offset-rocker heads with careful centering
- GM truck engines including LM7, LQ4, LQ9, LY5, LY6, L76, L96 and related Gen III / IV layouts
- 4.8L, 5.3L, 5.7L, 6.0L, 6.2L and 7.0L LS-family applications where mounting matches
Product Overview
A camshaft upgrade, broken spring, or smoking engine from worn valve-stem seals can often be serviced without removing the cylinder heads. This tool uses the factory rocker-bar mounting points to compress one or more springs while each valve is held up.
It does not support the valve and cannot replace the correct air adapter, rope method, or piston-position procedure. LS heads with offset rockers require the compressor to remain centered over the retainer.
Confirm rocker mounting pattern, head casting, spring diameter, engine family, and tool clearance. Some tool designs work one cylinder at a time and hardware quantity should match the photos.
Key Features & Performance
- Bolts to factory rocker stand locations
- Allows spring and seal work with heads installed
- Manual screw provides controlled compression
- Broad Gen III / IV LS-family coverage
Common Uses
- Replacing valve springs for a camshaft upgrade
- Changing valve-stem seals without head removal
- Repairing a broken spring on a street or truck LS engine
Technical Specifications
- Product Type: On-head valve-spring compressor
- Engine Family: GM Gen III / IV LS-based V8
- Mounting: Factory rocker-bar bolt locations
- Condition: New aftermarket tool
Installation & Fitment
- Bring the serviced piston near top dead center
- Support the valve with a proven method
- Remove and store rocker parts in order
- Keep the compressor centered and capture both keepers
- Torque all valve-train hardware and verify pushrod seating
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application that is not shown above. Model year, production date, serial number, engine or equipment specification, installed options, and previous repairs can change fitment. Match the original part, reference number, dimensions, connectors, mounting points, and product photos before purchase.
Frequently Asked Questions
Q: Can I use it without compressed air? A: An approved rope method may be used on some engines, but the valve must be securely supported by a proven service procedure.
Q: Does it fit LS7 or LS9 heads? A: Many similar tools do, but offset rocker geometry requires careful centering and exact mounting comparison.
Q: Can it compress double springs? A: Only if spring diameter, load, travel, and tool rating are suitable; verify before use.
Q: Is this an original-equipment part? A: No. This is a new aftermarket product. Brand names and part numbers are used only to identify compatible applications.
Part Summary
keywords: LS valve spring compressor tool, LS1 LS2 LS3 spring changer, LQ4 valve seal tool, GM Gen III IV on head compressor, LS7 LS9 valve train service
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, specifications, and application before purchase.