Cometic Custom Head Gaskets are comprised of three layers of stainless steel.  Cometic uses Stainless Steel for added strength , it's ability to rebound and it's natural resistance to corrosion.  They are constructed of 3-5 layers, the outer layers being .010 embossed stainless with a Viton Coating on both sides giving each layer a finish thickness of .010 and the inner core being of variable thickness flat Stainless to achieve the desired compressed thickness from .027 to .120.  This unique construction allows you to set your Compression Ratio, Valve to Piston or Piston to Cylinder Head clearances to exacting tolerances.  

The Viton Rubber Coating or in technical terms, Flouroelastomer Rubber Based Material will easily handle temperatures from 250 to 480*F.

The composition of these gaskets along with the interlocking embossments create unsurpassed sealing properties making them the ultimate choice for today's all Aluminium, Aluminium heads to Steel block and the traditional Steel on Steel engines.

Aluminium expands and contracts 1.7 times faster than steel, this causes tremendous shearing forces between the Aluminium head and the steel block attacking the structure of the gasket, trying to actually rip the gasket apart as the temperatures move up and down.  In the past Copper O-ring gaskets were the solution to big power on multi material engines, today we achieve superb sealing and longevity that is unheard of even with the traditional Copper Gaskets and especially composite gasket materials.  These gaskets will not work harden, they will not push between cylinders like a convention composite gasket and if installed and handled correctly they can be re-used.  The unique design and the properties of the Stainless Steel material promotes even loading for a superior seal, reduced brindling in the head and reduced bore distortion.  Copper gaskets are prone to work hardening in stressed areas causing hard spots and uneven torque loads which will eventually cause distortion of the bores and the cylinder head itself, these issues are resolved with the Cometic MLS Head Gaskets.

Re-torquing of head bolts is history, the only time you would retorque these gaskets would be on new STOCK head bolts, high quality bolts or seasoned factory bolts should not require a re-torque.

 

Good machining is critical in achieving a proper seal when using a MLS gasket, a RMS 36 or 80 MA finish is recommended, any quality machine shop can achieve this finish quality and it shouldn't cost any more.

Available for most domestic applications as well as Imports from cars to Motorcycles, ATV's and Snow Machines.

Perfect for all Naturally Aspirated, Supercharged, Turbo Charged and Nitrous Motors.

Available thickness: .027-.030-.036-.040-.045-.051-.060-.065-.071-.074-.120

CFM-20 Perforated Steel Core with Viton coating available in .043, .051 and .059 material Call for Pricing.

Stainless Spring Steel with a .001 thick coating of Viton Rubber available in .001, .014 and .020.  These replace the factory "Shim Gaskets"

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