Cometic Chevy Gen-1 Small Block V8 .030in MLS Cylinder Head Gasket - 4.125in Bore

SKU: CGSC5271-030

Head Gaskets

CG Head Gaskets...

Cometic Chevy Gen-1 Small Block V8 .030in MLS Cylinder Head Gasket - 4.125in Bore

Cometic Gasket

Cometic Chevy Gen-1 Small Block V8 .030in MLS Cylinder Head Gasket - 4.125in Bore

SKU: CGSC5271-030

Head Gaskets

CG Head Gaskets...

LAST ONE! Est Ship 4-7 days. LAST ONE! This is the last unit at our distribution centre. Contact us if you need more. The ETA is the approximate time required to prepare your order for dispatch.

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Description

MLS Gaskets are comprised of multiple embossed layers of both AMP (Advanced Multi-Polymer Coating) and uncoated stainless steel

Product Overview

Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0.036". World Products Man-o-War Block. 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:	Chevrolet Gen-1 Small Block V8 Cylinder Head Gasket
Engine Make/Size:	Chevrolet Small Block Gen I
Part Number:	cgsC5271-030
Position:	N/A
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 Chevrolet Gen-1 Small Block V8 .030 in MLS Cylinder Head Gasket, 4.125 in Bore, 18/23 Degree Head, Valve Pocketed Bore, Steam Holes
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 00:03:55

Features

Conforms load distribution across the sealing area
Embossed Outer Layers Coated w/Viton
Requires less clamp load creating less bore distortion
The center or shim layer is an uncoated stainless steel layer which can be varied to accommodate multiple thickness requirements
The embossed outer layers of the gaskets meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes

Specifications

Product Attributes - Brand: Cometic
Product Attributes - Manufacturer's Part Number: C5271-030
Product Attributes - Part Type: Head Gaskets
Product Attributes - Product Line: Cometic MLS Head Gaskets
Product Attributes - UPC: 00191070052225
Product Attributes - Bore (in.): 4.125 in.
Product Attributes - Bore (mm): 104.775mm
Product Attributes - Gasket Material: Multi-layer stainless steel
Product Attributes - Compressed Thickness (in.): 0.030 in.
Product Attributes - Compressed Volume (cc): 6.570cc
Product Attributes - Lock Wire: No
Product Attributes - Quantity: Sold individually.
Product Attributes - Notes: Valve pocketed bore.

Reference Information

Brand Name/s	Cometic Gasket
StreetFX SKU	cgsC5271-030
SFX Item ID	4171466
Supplier Item Code	4171466
Manufacturer SKU	C5271-030
Manufacturer UPC	191070052225
Alternative References	CAGC5271-030, CGT-C5271-030, Gen-1, .030in, 4.125in

Brochures

Primary brochure

Compatibility

Application Data

Make CHEVROLET
Beginning Year 1962
Ending Year 1969
Engine Type V8
Engine Family Chevy small block Gen I
Engine Size 5.3L/327
Make CHEVROLET
Beginning Year 1967
Ending Year 1969
Engine Type V8
Engine Family Chevy small block Gen I
Engine Size 4.9L/302
Make CHEVROLET
Beginning Year 1970
Ending Year 1980
Engine Type V8
Engine Family Chevy small block Gen I
Engine Size 6.6L/400
Application Notes Requires steam holes drilled.
Make CHEVROLET
Beginning Year 1970
Ending Year 2002
Engine Type V8
Engine Family Chevy small block Gen I
Engine Size 5.7L/350