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Cometic MLS head gaskets |
Post Reply | Page 123 5> |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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Posted: Dec/05/2018 at 7:40am |
Would like to know who is running these and if they are having good luck. I've got a fresh cast block/Indy Sr headed drag engine. It is around 14.5:1 comp. The engine was dynoed without incident and ran for 30 minutes and one awful pass at the track. After getting the car home I figured I would run the valves before pulling the rockers off and winterizing the car, There appeared to be a little water on the oil so I did a leakdown and found #3 was putting air in the radiator. Pulled the head and had it pressure tested and checked out at a reputable local shop and they said it looks perfect. I checked the deck surface out the best I could and it passes the feeler gauge test which is all I know to do, it looks freshly cut and smooth. The gasket has a small impefecrion on the lower left hand water jacket/fire ring area, which would appear to be the leak. I'm hoping it was some sort of fluke gasket issue, my plan is to clean everything up and reassemble, just wanted to make sure I shouldnt be thinking of something else while it's apart. Thanks, Andy.
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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Lenni AMC
AMC Nut Joined: Jun/05/2011 Location: Iceland Status: Offline Points: 427 |
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I used them when I put the new engine together for my Gremlin
I had the standard Felpro blue gaskets before. Haven´t had any problems with the Cometic Installed them dry with no copper spray or sealer on the gaskets |
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AMC Gremlin w/401
6.212 @ 117.01 - 1/8 Mile 9.785 @ 133.11 - 1/4 Mile https://www.youtube.com/channel/UCikyNqrfpMB8VzLd910Hkhg https://rbjracing1.wixsite.com/website |
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2450 |
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Ask Kevin "Stickshifter" I am sure he has used every kind of gaskets known over the years.
Since he has the same hardware as you he's one of a few here qualified to answer your question in that performance level. Tom
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POS #1
AMC Addicted Joined: Jan/28/2014 Location: Ohio Status: Offline Points: 500 |
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Hey Andy, when i first built the 407 iron block, sr heads. it kept blowing coolant... as it turned out the heads were not perfectly flat from INDY.... after i had the surface trued, no head gasket issue since... i have been using Rol gaskets...
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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My first impulse is to say it was more than likely a fluke. We have built several engines using the MLS gaskets and have encountered no problems so far.
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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343sharpstick
AMC Addicted Joined: Mar/10/2010 Location: Wisconsin Status: Offline Points: 554 |
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I use the Cometic MLS on everything I own from my 401 to motorcycles. |
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Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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Do you have the extra head bolts?
If not, might be worthwhile to add while it's apart.
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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The engine in my car is similar. Dome pistons and lots of compression. I could not hold a head gasket without the extra head bolts. With the extra head bolts and ROL gaskets I have never had a problem. I have never tried the cometic gaskets.
Edited by DragRacingSpirit - Dec/05/2018 at 2:47pm |
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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On my new engine we'll be using the MLS head gaskets. Engine builder told me it's important to machine the surface of the block mirror smooth. A standard decking like you'd do with the Fel-Pro gaskets isn't good enough. -Steve-
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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I do not have the extra headbolts. I would add them at this point given the opportunity, but the engine is still in the car. I will probably reassemble the way it is with a fresh gasket. I have a stock block, Im sure Kevin F has an Indy block and likely extra headbolts, so his setup is different, but Im happy to have anyone's opinion. Thanks, Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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