Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: 6g74 - What gasket did you use?

  1. #1
    Riding topless!! verified Feedback Score 0 Gearheadvr4's Avatar
    Join Date
    Sep 2010
    Owner Since
    Owned 8 3s since 2005.

    Location
    Corpus Christi
    Posts
    422
    Thanks
    2
    Thanked 29 Times in 10 Posts

    6g74 - What gasket did you use?

    For a 6g74 that's already built what head gasket would you use. What if you have a larger than stock bore of 93.2. How do you bore out a stock head gasket to match?

    If that's to much trouble then would you guys recommend a Cometic gasket? They make an oversized gasket for a 6g72 that works with a 6g74. The stock mls 6g74 is not for use on a turbo car.




  2. #2
    I AM IMPORT POWER Feedback Score 1 (100%)
    Join Date
    Sep 2010
    Owner Since
    2001

    Location
    Driving Vicki Crazy
    Posts
    1,457
    Thanks
    58
    Thanked 281 Times in 134 Posts
    OEM HGs, chamfer pistons.
    I would stay away from the Cometic. It's a 3 layer versus the OEM 4 layer.

    -Chris

  3. #3
    Forum User supporter Feedback Score 5 (100%)
    Join Date
    Oct 2010
    Owner Since

    Location
    Rosemead,Ca
    Posts
    413
    Thanks
    5
    Thanked 10 Times in 6 Posts
    Quote Originally Posted by Ninja Performance View Post
    OEM HGs, chamfer pistons.
    I would stay away from the Cometic. It's a 3 layer versus the OEM 4 layer.

    -Chris
    +1. we just chamfered the pistons with a mls 6g72 gasket

  4. #4
    Now with more poop-smear Not Verified Feedback Score 8 (100%) IPD's Avatar
    Join Date
    Sep 2010
    Owner Since
    Not Anymore

    Location
    Georgia
    Posts
    6,658
    Blog Entries
    2
    Thanks
    484
    Thanked 547 Times in 393 Posts
    i'm with those guys ^.

    i intend to do the same with my stroker build.

  5. #5
    Riding topless!! verified Feedback Score 0 Gearheadvr4's Avatar
    Join Date
    Sep 2010
    Owner Since
    Owned 8 3s since 2005.

    Location
    Corpus Christi
    Posts
    422
    Thanks
    2
    Thanked 29 Times in 10 Posts
    If I used a factory 6g74 which one do I need? I thought they wouldn't work because they are too thin and not really for turbo applications?

    Unfortunately camfering the pistons is not an option. The block I'm looking at is already professionally built. The block is a diamante-style non-crossover 6g74 block (out of a kia) with 20 over Ross pistons.
    Last edited by Gearheadvr4; 03-21-2011 at 06:56 PM.

  6. #6
    Forum User supporter Feedback Score 1 (100%) Rocket's Avatar
    Join Date
    Sep 2010
    Owner Since

    Posts
    202
    Thanks
    21
    Thanked 6 Times in 6 Posts
    [quote]Using the wrong gasket and then chamfering the pistons is a bit pointless to say the least. But then if you haven't done your homework to find out what's available it's to be expected.[\quote]

    Steve, I find the rest of your post to be pretty informative. This snippet though could be left off and you wouldn't rub so many raw even when you have good information. I don't personally know you. My guess a cantankerous old SOB that is just pretty gruff about everything. You have some good information to give sometimes, but the blunt attacks just cloud the issue and worthwhile things then get overlooked.

    If there is an option to actually use a correct OEM MLS gasket I would think that would be much better than camfering pistions, but both are options that can be considered.

    Steve, since he is .020 overbored will either of the stock gasket scenerios you listed work for him?

  7. #7
    Riding topless!! verified Feedback Score 0 Gearheadvr4's Avatar
    Join Date
    Sep 2010
    Owner Since
    Owned 8 3s since 2005.

    Location
    Corpus Christi
    Posts
    422
    Thanks
    2
    Thanked 29 Times in 10 Posts
    The pistons are Ray’s custom Ross 6g74 pistons – 20 over, supplied by Scott Merkel. Block was Line bored to 2.6775. Does that help any? I don't know yet what any other measurements are.

    No worries about offending me. It would take a lot to do that. No I have not done my homework at all. That's why I'm here to try and correct that.

  8. #8
    I AM IMPORT POWER Feedback Score 1 (100%)
    Join Date
    Sep 2010
    Owner Since
    2001

    Location
    Driving Vicki Crazy
    Posts
    1,457
    Thanks
    58
    Thanked 281 Times in 134 Posts
    Quote Originally Posted by steve68 View Post
    I'm sure Ray will know how far out of the block these pistons sit. As for the size? these motors are designed and built in mm not inches.

    so 2.6775 comes in as 68 and a bit mm........?
    Maybe it was 3.6775 inch, that will be 93.4085mm .
    20 thou over is roughly .5mm (.508mm)over the stock 93mm so should be 93.5mm.
    In this part of the world we got rid of inches years ago. We buy oversize pistons in multiples of .25mm 10 thou inch is .254mm. It confuses things un nessecarily.
    Line boring is actually align boring, which is what is done to main bearings (the block). Bores (cylinders) just get bored.

    Realistically you can't rely on anything on the net, you need to do your own measuring or you get the wrong information.

    Steve
    Do you post sillyness just to see if you can get away with it? Seriously? I really wish you would stop before someone takes your info as fact. And you are correct, you can't rely on everything you hear on the net....ringlands.

    -Chris

  9. The Following User Says Thank You to Ninja Performance For This Useful Post:


  10. #9
    Riding topless!! verified Feedback Score 0 Gearheadvr4's Avatar
    Join Date
    Sep 2010
    Owner Since
    Owned 8 3s since 2005.

    Location
    Corpus Christi
    Posts
    422
    Thanks
    2
    Thanked 29 Times in 10 Posts
    I will try calling Ray and get his opinion. He's built a couple of these with those pistons so he would probably know.

    The line bore info was just what I was told. Odd to me also that it was in inches. I don't have the block yet so I'm unable to make any measurements. I didn't think it would be so difficult to just get a couple of gaskets. Damn!!

    Edit: Well I got up the nerve to call Ray and he said they chamfered a lot of those pistons anyways and he explained how I would be able to tell. So I'm back to waiting till I get the block in to see what I have. From the information I got from the seller,i dont believe they were chamfered. Since they are probably not I'm still in the same situation and have absolutely no idea what to do and cannot go forward till I figure this out.
    Last edited by Gearheadvr4; 03-22-2011 at 10:52 AM.

  11. #10
    Forum User Not Verified Feedback Score 1 (100%)
    Join Date
    Sep 2010
    Owner Since

    Posts
    73
    Thanks
    25
    Thanked 44 Times in 32 Posts
    Quote Originally Posted by Gearheadvr4 View Post
    I will try calling Ray and get his opinion. He's built a couple of these with those pistons so he would probably know.

    The line bore info was just what I was told. Odd to me also that it was in inches. I don't have the block yet so I'm unable to make any measurements. I didnt think it would be so difficult to just get a couple of gaskets. Damn!!
    I'm sure Ray has the answers you're looking for, he's done more 6g7X strokers than anyone on the planet. Whether the info on the block is in standard or metric just depends on the machine shop that did the work. No biggie.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive
Jim's (RED3KGT) Reststop
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering