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Cometic C5712-075 Pontiac MLS Head Gasket Bore - 400/428/455 V8 4.300

(Pontiac GTO 1968-73, Firebird 1968-79, Grand Prix 1968-77, Grand Am 1973-75, Bonneville 1968-78, LeMans 1968-77, Catalina 1968-78 + 12 more models)

Part of: Cometic MLS Head Gasket Bore Honda

Other options in this family: Cometic C10336-036 Cometic H4230050S Cometic C9931 Cometic C10084040 Cometic C10083-030

Manufacturer

Picture for manufacturer Cometic

Part Number

C5712-075
12 reviews
Sale Price

$144.81

Estimated ship date Tuesday, November 24

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Product Details

The Cometic C5712-075 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Pontiac 400, 428, and 455 cubic inch V8 engines. This high-performance gasket features a 4.300-inch bore diameter and a compressed thickness of .075 inches (0.075"), making it ideal for both stock rebuilds and performance applications.

Key Features:

  • Multi-Layer Steel (MLS) construction provides superior sealing and durability under extreme cylinder pressures
  • 4.300-inch bore diameter accommodates standard and slightly over-bored Pontiac V8 blocks
  • .075-inch compressed thickness allows for precise compression ratio tuning
  • Engineered specifically for Pontiac 400, 428, and 455 V8 engines
  • Advanced embossed sealing beads ensure optimal combustion seal and coolant passage integrity
  • Withstands high temperatures and cylinder pressures found in performance applications

Cometic MLS gaskets are constructed from multiple layers of stainless steel, with embossed sealing beads that adapt to minor surface imperfections while maintaining superior combustion sealing. This design makes them the preferred choice for turbocharged, supercharged, and high-compression naturally aspirated engines. Perfect for engine builders and enthusiasts rebuilding classic Pontiac V8 powerplants.

Products specifications

Fits

Pontiac GTO 1968-73, Firebird 1968-79, Grand Prix 1968-77, Grand Am 1973-75, Bonneville 1968-78, LeMans 1968-77, Catalina 1968-78, Tempest 1968-70, Parisienne 1968-74, 1976, Grandville 1971-75, Executive 1968-70, Grand LeMans 1975-77 + 7 more models

Prop 65

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

Material

Multi-layer Steel

Easy Check out.

price is reasonable great web site don't have to go through an act of congress to find what you need. Thank you.

Great products, fast shipping, excellent prices, Thanks guys, looking forward to doing business with you again. , fast and easy.Very good website.

Good

I paid for 2nd day shipping and 5 days later they were shipped out. So, I should receive my rotors in a full week from when I paid for 2 day shipping. I called customer service and they discounted the shipping rate to ground service. At least they were polite and helpful in the phone.

Good

Great price!<br>Super fast shipping!<br>Conviently allow us to pay with Amazon log in and PayPal etc.<br>I ordered Jeep Rubicon Express part I couldn't find anywhere else.

Easy ordering and the best price I could find on the internet. However, I wouldn't have found this part by looking on the Autoplicity web site! The only way it showed up was doing a google search for that specific part.

It was easy and the price is good, but this is just the order. If I get the product in the same manor, that will be great. Thanks, Mike

quick and easy

quick and good price

Smooth and easy

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