What does the .040in sizing mean for this head gasket?

The .040in designation indicates that this head gasket is undersized by 0.040 inches compared to a standard bore. This is often used when engine components have been machined or when a specific compression ratio is targeted.

Do I need to use any sealant with these Cometic MLX head gaskets?

No, these Cometic MLX head gaskets are designed to be installed without any additional sealants. The Multi-Layer Stopper technology provides the necessary sealing capabilities on its own.

Will I need to re-torque the cylinder heads after installing these gaskets?

No, a key feature of the Cometic MLX head gaskets is that they do not require a re-torque procedure after the initial installation. This can simplify the engine assembly process.

Specifications

Brand: Cometic Gasket
Part #: C15373-040

Cometic Ford SB New Boss 302 4.200in Bore .040in MLX Head Gasket

Name: Cometic Ford SB New Boss 302 4.200in Bore .040in MLX Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-ford-sb-new-boss-302-4-200in-bore-040in-mlx-head-gasket-t14-133806
Price: 123.48 USD
Availability: BackOrder

$123.48

On Backorder

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

Fits 1969-2013 Ford Mustang. Cometic .040in MLX head gasket with a 4.200in bore. No sealants or re-torque required.

Key Features

Fits 1969-1971 and 2012-2013 Ford Mustang.
Cometic MLX head gasket with a 4.200 inch bore.
This gasket is .040 inch undersize.
Utilizes an integrated stopper layer for combustion chamber sealing.
Improved clamp load around the cylinder without bore distortion.
Made from the same materials as Cometic MLS Head Gaskets.

⚠️ 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

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Will it fit your car?

Fits these vehicles

Ford Mustang 1969-1971, 2012-2013

About this part

Product Details

This is a Cometic MLX head gasket for your Ford SB New Boss 302 engine, specifically designed for a 4.200-inch bore and sized at .040 inches undersize. These gaskets are crucial for sealing the combustion chamber between your cylinder head and engine block, preventing leaks and ensuring proper compression. They are built using the same materials as Cometic's Multi-Layer Steel (MLS) head gaskets, offering a well-built solution for your engine rebuild.

The MLX technology incorporates an integrated stopper layer. This layer helps provide a strong seal around the combustion chamber and improves the clamping force from the cylinder head bolts without causing distortion. A notable benefit of these gaskets is that they require no sealants to be applied, and they do not need to be re-torqued after initial installation, simplifying the assembly process.