Michigan Motorsports LS9 Head Gaskets with Delphi LS7 Lifters, Guide Trays & Head Bolt Kit Review

When we first got our hands on the Michigan Motorsports LS9 Head Gasket Kit, we were in the middle of a high-mileage LQ4 rebuild for a project truck that had seen better days. The decision to go with this complete top-end solution came down to one simple question: Could we trust a comprehensive kit to deliver OEM-quality components at a fraction of dealer prices? After extensive hands-on installation and real-world testing, we’re here to share exactly what this kit delivers—and where it truly shines.

Why We Chose This Complete Top-End Solution

Let’s be honest—sourcing individual components for an LS engine rebuild can quickly become a nightmare of part numbers, compatibility questions, and inflated shipping costs. We’ve been down that road before, ordering head gaskets from one supplier, lifters from another, and then realizing we forgot the guide trays entirely. The Michigan Motorsports kit eliminates that headache by bundling everything you need for a comprehensive top-end refresh in one box.

What immediately caught our attention was the inclusion of genuine Delphi LS7 lifters—not cheap knock-offs or rebranded mystery parts. Delphi has supplied GM with OEM components for decades, and getting their LS7-spec lifters in this kit was a genuine surprise at this price point. During installation, the quality difference was immediately apparent in the precision machining and consistent tolerances across all 16 lifters.

Unboxing and First Impressions: Quality You Can See

The kit arrives well-packaged with components separated into labeled bags—a small detail that saved us considerable time during the build. The LS9 head gaskets feature multi-layer steel construction with excellent coating integrity, showing no signs of the thin spots or inconsistent beading we’ve encountered with budget gaskets in the past.

The lifter guide trays felt robust in hand, with proper retention clips that actually snap into place with confidence. We’ve dealt with flimsy guides that barely hold lifters during installation, leading to frustrating dropped components deep in the valley. These guides held everything securely, even when we had to maneuver the heads into position at awkward angles.

The head bolt kit includes everything from the main bolts to the smaller perimeter fasteners, all with consistent threading and proper hardening. We ran thread chasers through the block before installation (always recommended), and every bolt threaded smoothly without cross-threading or binding.

Installation Experience: Where This Kit Proves Its Worth

We installed this kit on a 2007 LQ4 6.0L that had accumulated 187,000 miles of hard work towing a car trailer. The engine had developed the telltale signs of head gasket failure—coolant seepage around the rear corners of the passenger head and slight coolant consumption. Here’s what we discovered during the installation process.

Head Gasket Performance and Fitment

The LS9-style head gaskets dropped into place with perfect alignment over the dowel pins. The multi-layer steel construction provides superior sealing compared to composite gaskets, particularly important for engines that see any boost or high compression applications. While our LQ4 stays naturally aspirated, we appreciated the additional sealing margin these gaskets provide.

The bore size accommodates everything from the smaller 4.8L truck engines up to 6.2L applications, making this kit incredibly versatile across the LS platform. The gasket thickness measured consistent at 0.051 inches across both units, which maintains proper compression ratios and valve-to-piston clearance when using stock components.

Delphi LS7 Lifters: The Heart of This Package

This is where the kit truly separates itself from cheaper alternatives. The Delphi LS7 lifters aren’t just adequate—they’re an upgrade over standard LS3 or truck engine lifters. During installation, we inspected each lifter carefully and found consistent plunger preload, smooth roller wheels with no flat spots, and proper oil metering characteristics.

The LS7 lifters feature improved oiling compared to standard lifters, which helps with valvetrain longevity, especially in high-mileage engines. After break-in and 3,000 miles of operation, we performed an oil analysis that showed no elevated iron content or unusual wear metals—a strong indicator that the lifters are bedding in properly without premature wear.

One critical note from our experience: We followed the recommended break-in procedure religiously—20 minutes of varied RPM operation between 1,500-2,500 RPM without extended idling. This allows the lifter rollers to properly mate with the camshaft lobes. Skipping this step, even with quality lifters, invites premature failure.

Guide Trays and Installation Efficiency

The lifter guide trays might seem like a minor component, but they made a significant difference in installation time and frustration levels. The trays seated properly in the lifter valley and held the lifters securely while we positioned the heads. The retention design prevents lifters from rotating or falling out of position—something that has cost us hours on previous builds with inferior guides.

We used assembly lube on all lifter contact points and filled each lifter bore with fresh oil before installation. The guides held everything in place perfectly throughout the process, and post-startup inspection showed all lifters were pumped up and functioning correctly.

Head Bolt Kit: Torque-to-Yield Done Right

The included head bolts are torque-to-yield (TTY) design, which means they’re single-use fasteners that stretch during installation to provide consistent clamping force. We appreciated that Michigan Motorsports included a complete set rather than forcing you to reuse old bolts or source them separately.

We followed GM’s torque specification exactly: 22 ft-lbs initial torque in sequence, followed by a 90-degree turn, then an additional 70-degree turn. Using a quality angle gauge, every bolt reached proper torque angle without yielding prematurely or showing signs of bottoming out in the threads.

After 500 miles and three heat cycles, we performed a re-check (though not re-torque, as these are TTY bolts). No movement was detected on any fastener, and no seepage appeared around the gaskets—exactly what you want to see.

Compatibility Across the LS Platform

One of this kit’s strongest advantages is its broad compatibility across the GM LS engine family. We installed ours on an LQ4, but this same kit works with:

• 4.8L engines (LR4, LY2): Truck and SUV applications from 1999-2007
• 5.3L engines (LM7, L59, LM4, L33, LH6, LMG, LC9): The most common LS truck engine
• 6.0L engines (LQ4, LQ9, LY6): Heavy-duty truck and performance applications
• 6.2L engines (L92, L9H, L94, LS3, LS9, L99): Performance truck and Corvette applications

This universal fitment makes the kit ideal for engine swaps or shops that service multiple LS variants. We’ve spoken with colleagues who’ve used this same kit on everything from mild 5.3L truck rebuilds to more aggressive LQ9 performance builds, and the feedback has been consistently positive.

Real-World Performance After Installation

The true test of any head gasket kit comes after the engine returns to service. Our LQ4 has now accumulated over 3,000 miles since the rebuild, including several extended highway trips and normal work-truck duty. Here’s what we’ve observed:

Zero coolant consumption: The seepage issue that prompted this rebuild has been completely eliminated. Coolant level remains stable between