What does MLS construction mean for this gasket?

MLS stands for Multi-Layer Steel. This construction uses several layers of steel to create a strong, flexible seal that can handle high temperatures and pressures common in big block V8 engines.

What is the significance of the .040 inch thickness and 4.680 inch bore?

The .040 inch thickness is a standard dimension for many engine builds, affecting compression ratio. The 4.680 inch bore is specific to the cylinder bore size of the engine it's designed for, ensuring a proper seal around the combustion chamber.

Does this gasket come with any installation hardware?

This product is for the cylinder head gasket only. It does not include head bolts or other installation hardware, which should be sourced separately if needed.

1 / 2

Specifications

Brand: Cometic Gasket
Part #: C15680-040
UPC: 191070588564

Cometic Chevy Mark-IV GM Gen-V/VI Big Block V8 .040in MLS Cyl Head Gasket-4.680in Bore-Round Bore

Name: Cometic Chevy Mark-IV GM Gen-V/VI Big Block V8 .040in MLS Cyl Head Gasket-4.680in Bore-Round Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevy-mark-iv-gm-gen-v-vi-big-block-v8-040in-mls-cyl-head-t14-803775
Price: 109.00 USD
Availability: BackOrder

$109.00

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Cometic is known for well-built gaskets. This MLS head gasket fits many Chevy Mark-IV, GM Gen-V/VI Big Block V8 engines, offering a .040in thickness and 4.680in bore.

Key Features

Fits Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 engines.
Multi-Layer Steel (MLS) construction for reliable sealing.
.040 inch gasket thickness.
4.680 inch bore diameter.
Designed for round port cylinder heads.

⚠️ 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 it fit your car?

About this part

Product Details

Cometic Gasket is well-known for making dependable engine sealing solutions. This Multi-Layer Steel (MLS) cylinder head gasket is built for Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 engines. It features a .040 inch thickness and a 4.680 inch bore diameter, designed for a round port configuration. This gasket is a solid option for rebuilding or repairing a wide range of these classic V8s, including models like the Chevrolet C10 Pickup, Camaro, and Impala from the mid-60s through the early 80s.

MLS gaskets are a popular choice for performance and heavy-duty applications because they offer excellent sealing under high pressure and temperature. The multiple steel layers conform to the mating surfaces, creating a strong seal that resists leaks. This particular gasket is sized for a 4.680 inch bore, which is common for many big block V8 configurations, and its .040 inch thickness is a standard dimension for many builds. Using the correct gasket is crucial for proper engine compression and preventing coolant or oil leaks between the cylinder head and the engine block.