Cometic GM LS9/LSA Gen-4 Small Block V8 .040in MLX Cylinder Head Gasket 4.100in Bore LHS

SKU: CGSC5986-040

Head Gaskets

CG Head Gaskets...

Cometic GM LS9/LSA Gen-4 Small Block V8 .040in MLX Cylinder Head Gasket 4.100in Bore LHS

Cometic Gasket

Cometic GM LS9/LSA Gen-4 Small Block V8 .040in MLX Cylinder Head Gasket 4.100in Bore LHS

SKU: CGSC5986-040

Head Gaskets

CG Head Gaskets...

Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

We accept

Description

MLX Gaskets utilize an integrated "stopper" layer for combustion chamber sealing

Product Overview

Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0.098". Cometic MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flour elastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.

Features and Benefits

Embossed Outer Layers Coated w/Viton

Product Details

Description:	GM LS9/LSA Gen-4 Small Block V8 Cylinder Head Gasket
Part Number:	cgsC5986-040
Position:	Left
Prop 65 (C, R or CR):	CR
Prop 65 - Short Label:	Prop_65.jpg
Prop 65 Warning Label:	Prop_65.jpg
Prop 65 Yes/No:	Yes
Title:	Cometic Gasket Automotive GM LS9/LSA Gen-4 Small Block V8 .040 in MLX Cylinder Head Gasket, 4.100 in Bore, LHS
WARNING CA Proposition 65 Message:	The state of California has determined that certain chemicals used in the manufacture of this product have been known to cause cancer and birth defects. For more information; visit www.p65Warnings.ca.gov
WARNING CA Proposition 65:	Yes

Part Type

Engine Cylinder Head Gasket

Data: v4.2 - Upd: 2026-10-14 00:07:56

Features

Embossed Outer Layers Coated w/Viton
Improved clamp load around the cylinder without increasing bore distortion

Specifications

Product Attributes - Brand: Cometic
Product Attributes - Manufacturer's Part Number: C5986-040
Product Attributes - Part Type: Head Gaskets
Product Attributes - Product Line: Cometic MLX Head Gaskets
Product Attributes - UPC: 00191070074586
Product Attributes - Bore (in.): 4.100 in.
Product Attributes - Bore (mm): 104.140mm
Product Attributes - Gasket Material: Multi-layer stainless steel
Product Attributes - Compressed Thickness (in.): 0.040 in.
Product Attributes - Compressed Volume (cc): 8.654cc
Product Attributes - Lock Wire: No
Product Attributes - Quantity: Sold individually.
Product Attributes - Notes: Driver side head gasket for use with LS9 applications only.

Reference Information

Brand Name/s	Cometic Gasket
StreetFX SKU	cgsC5986-040
SFX Item ID	4168403
Supplier Item Code	4168403
Manufacturer SKU	C5986-040
Manufacturer UPC	N/A
Alternative References	CGT-C5986-040, LS9/LSA, Gen-4, .040in, 4.100in