KZDAZ MLS Header Manifold Gasket Kit — 2 Gaskets + 12 Bolts, LS-Series Fit, Heat-Resistant Seal

KZDAZ Multi-Layer Steel (MLS) header manifold exhaust gasket kit replaces worn exhaust seals on most LS-series engines and includes the correct bolts for a complete swap.

This kit is engineered to restore a reliable, heat-resistant seal between the exhaust manifold/header and the cylinder head for GM LS-family engines (excluding LS7). Built from layered steel for durability under high temperatures and supplied with the matching fasteners, the set addresses exhaust leaks and helps maintain proper backpressure and engine efficiency. Before ordering, confirm fitment against your vehicle’s engine code and part numbers listed below.

Will this gasket kit fit my LS engine and which vehicles are supported?

The KZDAZ MLS header gasket is designed for a broad range of LS-series powerplants — from small-block 4.8L units up to 6.2L variants — but it is not compatible with LS7. It suits many Chevy and GMC platforms including Silverado, Suburban, Avalanche, Yukon, as well as Cadillac models like CTS and Escalade. Match the replacement part numbers and your engine code to ensure proper compatibility.

• Covers many LS family engines: LS1, LS2, LS3, LS6, LM4, LM7, LMG, LQ4, LQ9 and others (LS7 excluded).
• Common vehicle applications: Silverado, Suburban, Avalanche, Yukon, Escalade, CTS and related GM platforms.
• Reference replacement numbers: 12617944, 12600530, 12620947, 12558573 for cross-checking.

How does the multi-layer steel design help performance?

Multiple precision-formed steel layers increase resistance to heat cycles and maintain a consistent compressive seal where exhaust manifolds meet the head. That stronger seal reduces the chance of exhaust leaks that can affect backpressure and sensor readings, helping the engine run closer to its intended efficiency. It’s a durable, service-oriented upgrade over single-layer paper or composite gaskets.

• High-temperature steel layers resist warping and gasket blowout under repeated heating.
• Improved sealing prevents leakage and minimizes exhaust-pressure fluctuations.
• Designed to preserve proper sensor performance and engine efficiency.

What does the kit include and how straightforward is installation?

The package contains two MLS exhaust manifold/header gaskets and a set of twelve bolts sized to replace the original fasteners. Installation requires no special modifications: clean the mating surfaces, align the gaskets, and torque the supplied bolts to specification. If you’re comfortable with basic mechanical tasks and have torque tools, the swap is typically a direct fit.

• Kit contents: 2 MLS gaskets plus 12 OE-style bolts (OE bolt number 551696 reference).
• Installation tips: fully clean mating surfaces and follow torque sequence for leak-free sealing.
• Customer support available for fitment or installation questions.

How can I confirm this is the correct replacement for my vehicle?

Verify the part by comparing the listed replacement numbers and checking the engine designation in your vehicle’s service documentation. If you’re unsure, consult your mechanic or provide your VIN and engine code to cross-check fitment. Always confirm compatibility before purchase to avoid returns and install delays.

• Compare OEM/aftermarket numbers: 12617944, 12600530, 12620947, 12558573.
• Confirm engine family and displacement (e.g., 4.8L, 5.3L, 5.7L, 6.0L, 6.2L).
• Contact seller support for verification using VIN or engine code if needed.

Who is this for? The KZDAZ MLS header manifold exhaust gasket kit is intended for DIY mechanics, independent shops, and vehicle owners running GM LS-series engines who need a durable, OE-replacement-quality gasket and the correct bolts to complete the job. It’s suitable when you’re repairing exhaust leaks, replacing warped manifold flanges, or completing a manifold/header swap and want a heat-resistant, multi-layer steel sealing solution.