Head Gasket selection and thickness

macipusy · Post by **macipusy** » Sat Mar 20, 2010 7:07 pm

I am trying to figure out the CR for my new 2.35L build and my HG choice is between OEM or Cometic.

I know the Cometic is .051" compressed thickness and 98mm bore

Is the OEM .059" compressed thickness? Is it 98mm bore?

Pros and cons on OEM vs Cometic?

Post by **Legacy777** » Sun Mar 21, 2010 11:10 pm

I've got the OEM gasket in the garage. I'll try and take some measurements this week.

Post by **Legacy777** » Mon Mar 22, 2010 2:03 am

On the OEM ej22t gasket I measured in the garage, the bore was 98mm.

Compressed thickness was around .065"

macipusy · Post by **macipusy** » Mon Mar 22, 2010 4:25 pm

Thanks for the measurement Josh. This should help me get some final CR calculations.

What about as far as quality, strength and reliability between OEM and Cometic?

Post by **Legacy777** » Mon Mar 22, 2010 5:31 pm

Check out this recent thread of mine about that discussion.

http://bbs.legacycentral.org/viewtopic.php?f=5&t=43288

ciper · Post by **ciper** » Wed Mar 24, 2010 3:07 am

Did you squeeze the gasket legacy777? I think it might be thinner when compressed. It supposedly matches the DOHC 2.5 gasket thickness which i measured in post 241 of this thread http://forums.nasioc.com/forums/showthr ... 27&page=10

macipusy · Post by **macipusy** » Wed Mar 24, 2010 3:55 am

I did a bunch of research a while ago and looking back at my notes I found OEM HG thickness at .059" or 1.5mm.

It would be nice to confirm this since the difference in thickness between OEM and Cometic changes my CR calcs.

cj91legss · Post by **cj91legss** » Thu Mar 25, 2010 3:24 pm

I'm going to try running the cometics with my dohc swap im working on right now... How about a Poll?

NICO · Post by **NICO** » Fri Mar 26, 2010 12:37 am

cometic for our cars, is this only a canadian part?

Post by **Legacy777** » Sat Mar 27, 2010 4:32 am

ciper wrote:Did you squeeze the gasket legacy777? I think it might be thinner when compressed. It supposedly matches the DOHC 2.5 gasket thickness which i measured in post 241 of this thread http://forums.nasioc.com/forums/showthr ... 27&page=10

I'll try it again. Also depends on where I measured too.

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Head Gasket selection and thickness

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