Delphi LS7 Lifter Set with Guide Trays - Direct Fit for GM LS Engines

In this review the Michigan Motorsports Delphi LS7 lifter set is evaluated as a practical replacement for worn lifters in GM LS platforms. The package includes 16 Delphi LS7 hydraulic roller lifters and 4 OEM-quality guide trays, making it a straightforward swap for engines using factory lifter guides. The single biggest reason to buy is value: Michigan Motorsports purchases these Delphi lifters in volume to offer a lower price while providing direct replacements for GM part numbers 12499225 and 25341990, which simplifies rebuilds and valvetrain refreshes.

Key Features

• Complete OEM-style kit: Includes 16 hydraulic roller lifters and 4 guide trays so you get a full set for a V8 without hunting parts separately.
• Direct replacement fit: Matches GM part numbers 12499225 and 25341990 to ensure compatibility with factory lifter guides and correct alignment.
• Wide engine compatibility: Designed for popular LS platforms including LS1, LS2, LS3, LS6, LQ4, LQ9, LY5, LY6 and LM7 for many 4.8L to 6.2L engines.
• Hydraulic roller design: Optimized for hydraulic roller camshafts to maintain proper valve operation with stock and upgraded cam profiles.
• Cost-conscious sourcing: Bought in large quantities by Michigan Motorsports to deliver a competitive price while providing OEM-quality components.

Who It's For

This lifter set is best for DIY mechanics, shop technicians, and enthusiasts performing a full valvetrain refresh or rebuilding a GM LS V8 where the original lifters are worn or noisy. It suits owners doing camshaft upgrades who need hydraulic roller lifters that fit factory guides and want a complete 16-piece set with guide trays included.

Those restoring high-performance engines that demand aftermarket specialty lifters with exotic coatings or race-spec clearance should look elsewhere; this kit is a direct replacement OEM-style product focused on fit and value rather than race-only tolerances or custom lifter geometry.

Pros & Cons

Pros

• OEM-quality Delphi construction provides reliable fit and consistent operation in compatible LS engines.
• Includes guide trays so installation is simplified and parts are matched as a set.
• Excellent value due to volume purchasing, making a full set affordable for rebuilds or swaps.
• Direct replacement for common GM part numbers reduces fitment questions during installation.

Cons

• Some customers report mixed comments about noise level, so lifter noise may vary by engine condition.
• A small number of reports mention concerns tied to engine condition after installation, so inspect related components before fitting.

Specifications

Brand	Michigan Motorsports (Delphi parts)
Included items	16 Delphi LS7 hydraulic roller lifters, 4 lifter guide trays
Replaces GM part numbers	12499225 and 25341990
Compatible engines	LS1, LS2, LS3, LS6, LQ4, LQ9, LY5, LY6, LM7 and other LS-based 4.8L-6.2L engines
Application	Hydraulic roller camshaft valvetrain replacement
Package quantity	Set of 16 lifters with 4 guide trays

Our Verdict

The Delphi LS7 lifter set from Michigan Motorsports is a sensible, cost-effective choice for anyone needing a full OEM-style lifter replacement on GM LS V8 engines. It provides correct fitment for the listed GM part numbers and includes guide trays for a clean installation, making it good value for rebuilds and swaps while remaining a practical option for cam upgrades that retain hydraulic roller operation.

Frequently Asked Questions

Are these lifters a direct fit for LS truck engines?
Yes, they replace GM part numbers 12499225 and 25341990 and are compatible with LQ4/LQ9 and other LS-based 4.8L-6.2L engines that use Delphi LS7-style lifters.

Do the guide trays come with the lifters?
Yes, the set includes four OEM-quality guide trays packaged with the 16 lifters for a complete installation.

Will these lifters reduce valvetrain noise?
They are OEM-quality replacements and can restore proper operation, but customers have reported mixed noise levels depending on engine condition, so inspect pushrods, rocker arms and the cam before assuming lifters are the only cause.