# Cometic Pontiac 389/421 V8 4.3in Bore .040in MLS Head Gasket

The HP shim technology increases clampload around the combustion chamber, thereby increasing the sealability of the head gasket around the open deck block.

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

This Part Fits:

Year

Make

Model

Submodel

1949-1954

Jaguar

XK120

Base

1952-1954

Jaguar

XK120

M

1955-1957

Jaguar

XK140

Base

1955-1957

Jaguar

XK140

M

1955-1957

Jaguar

XK140

MC

1958-1961

Jaguar

XK150

Base

1958-1961

Jaguar

XK150

S

1959-1966

Pontiac

Bonneville

Base

1959-1962

Pontiac

Bonneville

Custom

1959-1966

Pontiac

Bonneville

Safari

1964-1966

Pontiac

Catalina

2+2

1959-1966

Pontiac

Catalina

Base

1959-1966

Pontiac

Catalina

Safari

1962-1966

Pontiac

Catalina

Ventura

1962-1966

Pontiac

Grand Prix

Base

1964-1966

Pontiac

GTO

Base

1959-1966

Pontiac

Star Chief

Base

1966

Pontiac

Star Chief

Executive

1961,1963-1966

Pontiac

Tempest

Base

1964-1965

Pontiac

Tempest

Custom

1961

Pontiac

Tempest

LeMans

1961,1963-1966

Pontiac

Tempest

Safari

1960-1961

Pontiac

Ventura

Base

## Details

- **Price:** 159.26 CAD
- **Vendor:** Cometic Gasket
- **Type:** Head Gaskets

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 159.26 CAD | In stock |

## Images

- Photo - Primary
- User 9
- Installation Instructions
- Logo Image

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/cometic-pontiac-389-421-v8-4-3in-bore-040in-mls-head-gasket)
> Updated: 2026-06-27