View Poll Results: What is the better Headgasket
Voters: 10. You may not vote on this poll
Cometic Vs. OEM Headgasket
08-10-2010, 01:32 AM
#4
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OEM... its the only thing i use and recommend. the oem is very thick and durable actually and can hold 400 easy... Id worry more about using upgraded headstuds more then the actual head gasket. the gasket is usually one of the last things that fail on this motor
08-10-2010, 02:09 AM
#5
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any cometic users wanna chime in? would like to get opinions from both sides of the spectrum... what seems to be the issue with the cometic hg? bad design? crappy material? just curious
08-10-2010, 02:24 AM
#6
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THIS.
Cometic fails.
08-10-2010, 01:52 PM
#9
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oem is 3 peice. but the middle peice has compression rings around the cylinder to seal it vs the solid piece
Last edited by TCpete; 08-10-2010 at 02:35 PM.
08-10-2010, 02:55 PM
#10
08-10-2010, 03:02 PM
#11
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We use the factory-style OEM gasket. Both the oem gasket and cometic gasket for the 2az-fe motor are MLS gaskets, ie. they are comprised of 3 layers of steel, with a viton coating on the two outer layers. They are similiar in design in terms of material, thickness, and number of layers. But what makes the oem gasket more suited for forced induction application is the design of the middle layer.
The middle layer of the oem gasket does not span the entire area of the deck like the top and bottom two layers. The middle layer only covers the thickness of the deck area surrounding the combustion chamber, sort of like a fire ring. The thickness of the middle layer is about 2 thou in thickness so essentially when the head is bolted down onto the block, it creates a tigher seal around the bore's deck surface. What this does is creates something similiar to a "step-deck" block, where the cylinder bore's deck surface is machined a few thou higher than the rest of the block's deck surface.
MrC
08-10-2010, 03:25 PM
#14
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MrC
08-10-2010, 03:29 PM
#15
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