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Cometic C5434-086 MLS Cylinder Head Gasket Bore Chevy Big Block - 4.630 086

(Chevrolet Camaro 1967-72, Corvette 1965-74, Impala 1965-76, Malibu 1965-67, 1973-75, C1500 1990, Chevelle 1965-73, Blazer 1973-74 + 96 more models)

Part of: Cometic MLS Cylinder Head Gasket Chevy Big Block Bore

Other options in this family: Cometic C5331-080 Cometic C5816-045 Cometic C5332-040 Cometic C5760-040 Cometic C5434-066

Manufacturer

Picture for manufacturer Cometic

Part Number

C5434-086
7 reviews
Sale Price

$148.68

Estimated ship date Thursday, November 26

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Product Details

The Cometic C5434-086 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines. Featuring a 4.630-inch bore diameter and .086-inch compressed thickness, this gasket delivers exceptional sealing performance for high-performance and racing applications.

Key Features:

  • Multi-Layer Steel (MLS) construction provides superior combustion sealing and durability
  • 4.630-inch bore diameter accommodates standard and performance engine builds
  • .086-inch compressed thickness allows for precise compression ratio tuning
  • Undersized water ports designed for aftermarket cylinder heads, allowing custom port matching
  • Compatible with Chevrolet Mark-IV, Gen-V, and Gen-VI Big Block V8 engines
  • Engineered to withstand extreme cylinder pressures and temperatures

Cometic's MLS gaskets feature multiple layers of stainless steel with advanced coating technology that accommodates engine movement and thermal expansion while maintaining a reliable seal. The undersized water ports give engine builders the flexibility to customize coolant flow by matching ports to specific aftermarket cylinder head configurations. Ideal for street performance, drag racing, and high-boost applications where gasket reliability is critical.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1965-74, Impala 1965-76, Malibu 1965-67, 1973-75, C1500 1990, Chevelle 1965-73, Blazer 1973-74, C10 Pickup 1968-74, Caprice 1966-76, C10 1975-80, El Camino 1966-75, Monte Carlo 1970-75, Nova 1969-72 + 90 more models

Prop 65

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Material

Multi-layer Steel

Quick shipping, lowest prices.

So far, so good.

GREAT PRICES AND COMMUNICATION!!!! HIGHLY RECOMMENDED STAFF AND PRODUCTS!!!!!

I ordered a Thule 9001 order number 27522 bike rack for my vehicle late Monday evening and received the product on Friday. Quick shipping with the free shipping option. Very happy with purchase and with autoplicity! Will def order from them again! Also the price was 30 to 40 bucks cheaper with autoplicity.

My Superchips Cortex arrived within a few days of order and by far was the best price arround. Product arrived in perfect condition and worked as described. Great deal. Order #10984

In a rush to get my car up and running, Autoplicity had the best price on the items I needed, and in stock as well as shipped quickly. Just what I was looking for, thanks!

Great price. Minor problems with shipping because of UPS (dropped box and broke part, late delivery). Autoplicity sending me out replacement part.

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