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Thread: Cometic mls Head gasket question

  1. #1
    Join Date
    Oct 2018
    Location
    Carbondale Pennsylvania
    Posts
    38
    My Cars
    ‘94 325i, ‘18 Tundra

    Cometic mls Head gasket question

    Hey what’s up everyone, I’m in a process of doing a turbo build on my 94 vert .
    I’m about to lift up the head in a day or two , depending on when my timing locking blocks get here.
    i know there’s been a lot of debate on this but I’m running a cometic mls hg (.140/85) so my question is,who has gotten away with just machining the head and not the block? I’ve seen a lot of different views on this . Some say it has to be decked and some say I can get away with just really prepping the block with a scotch bring and other materials?

    Heres the picture of the drift vert
    Last edited by DSGBUILT; 10-06-2018 at 11:47 PM.

  2. #2
    Join Date
    Mar 2012
    Location
    Renton, Wa
    Posts
    5,429
    My Cars
    98 m3
    Gotta do the block for the mls


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  3. #3
    Join Date
    Jan 2016
    Location
    Littleton, Co
    Posts
    109
    My Cars
    E36 S52 M3/4/5 Cos. Blk.
    I only had the head machined. Along with my friend who had been running 16-18psi on his s50. We both cleaned the block really well but there’s no way in hell the surfaces were near what they should have been. I personally have only run 7psi so far. Neither of us had any issues yet but it’s most likely inevitable. If you can go for a more reliable option, do it. I assumed I could only do mls because the block was in the car the whole time. Idk if it’s reasonable to do cut-ring without removing the motor, but if you can avoid an mls, why use one? I only plan to run 14psi or so. So your mls will work if you prep the surface by hand, but for how long, and how much boost can you get away with is probably the question. I have regrets, but I stopped worrying about it because I’m not going back now.
    '97 BMW M3/4/5, Cosmos Black.

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