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Cometic MLS head gaskets |
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Red Devil 
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Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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 Posted: Dec/05/2018 at 4:25pm |
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FWIW, I drilled & tapped for the extra head bolts for Indy SRs in an AMC block with the engine still in the car (didn't have access to a hoist at the time). I used a 90 deg. angle drill and the heads with drill bushings in the extra holes to guide the drill bit and tap. Drilled small pilot holes first with a small ID drill bushing then larger up to tap drill size and tapped by hand with a drill bushing to guide the tap to keep it square. Used a magnet to clean out any cuttings and flushed the block thoroughly.
In hind sight, it would have been much easier to pull the engine. Some machinists may cringe, but it worked - just took extra care and time. Extra bolts weren't needed for my application, just did it because I could. Hope this helps,RD.
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Coloradoamx
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Joined: Jul/02/2007 Location: Parker, CO Status: Offline Points: 583 |
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Posted: Dec/05/2018 at 5:52pm |
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MLS gaskets are very good, Cometic especially, however, if you have over 13:1 compression, you are asking for trouble without the extra headbolts.
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amx600rr
Supporter of TheAMCForum 
Joined: Jan/26/2014 Location: Florida Status: Offline Points: 420 |
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Posted: Dec/05/2018 at 8:06pm |
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I do not have experience with MLS gaskets.
At 14.5 compression I believe You will need the copper head gasket and o-ringed block. I have used FlatOut Group Rubber Coated Copper gaskets on my o-ringed 401 w/ iron 502-2 heads. |
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Grey Ghost
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Joined: Oct/11/2009 Location: Route 66 Il. Status: Offline Points: 158 |
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Posted: Dec/06/2018 at 9:46pm |
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I HAVE THE SR HEADS WITH 13.5 COMPRESSION AND THE EXTRA HEADBOLTS AND I USE SCE ICS TITAN COPPER GASKETS, THEY HAVE THE O-RING BUILT IN HAVE NOT HAD A HEAD GASKET ISSUE FOR AT LEAST 7 YEARS AND I WAS TOLD THEY ARE REUSABLE
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Lets go racing!
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DragRacingSpirit
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Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Posted: Dec/07/2018 at 1:07pm |
At one
point Kevin was running with an oem iron block with the older Indy head castings. When
he got his Indy aluminum block he drilled it for both the std Indy
castings and the CNC300 castings. I hope he doesn't mind reposting this pic. It was on this forum somewhere. I had to save it :) The bottom row of bolts is for the CNC castings the holes above that that he filled in with a threaded aluminum stud and machined flat is for the std casting. So He is set to use either casting that he wishes.  |
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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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i6cj7
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Joined: Feb/20/2018 Location: virginia Status: Offline Points: 138 |
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Posted: Dec/22/2018 at 11:01pm |
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would head studs help sealing if one didn't get the extra head bolt holes drilled?
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Lenni AMC
AMC Nut
Joined: Jun/05/2011 Location: Iceland Status: Offline Points: 427 |
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Posted: Dec/23/2018 at 3:40am |
Yes |
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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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amx390ssc
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Joined: Jul/14/2015 Location: Bath, Pa Status: Offline Points: 49 |
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Posted: Dec/27/2018 at 9:51am |
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A second Yes for head studs!!!
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i6cj7
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Joined: Feb/20/2018 Location: virginia Status: Offline Points: 138 |
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Posted: Dec/27/2018 at 10:54am |
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too bad I didn't get the latest edelbrock heads that have the head bolt area machined down for header clearance when using studs .
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pfordamx
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Joined: Sep/13/2010 Location: OKC Status: Offline Points: 173 |
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Posted: Jan/21/2019 at 11:00pm |
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we have had nightmares with headgaskets 15.1 418 with indy srs went through 3 sets of cometics on a brand new engine would always pressurize the coolant system with load has yet to make a full pass. although i don't believe the gaskets are the issue the last time our engine was apart it was noted that the center water jackets in the indy heads are huge and actually going within the compression ring where the head was pushing the gasket wasn't compressed because it was in the water jacket. we had the center water jackets on both heads tig welded and built up and heads surface and now they should actually clamp the gasket. its not back together yet to prove if this worked or not but it should be soon and its going on a dyno to find out if its fixed.
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brownspirit wrote: