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Cometic MLS head gaskets

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Red Devil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red Devil Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2018 at 4:25pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Coloradoamx Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2018 at 5:52pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote amx600rr Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2018 at 8:06pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Grey Ghost Quote  Post ReplyReply Direct Link To This Post Posted: Dec/06/2018 at 9:46pm
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
Lets go racing!
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DragRacingSpirit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DragRacingSpirit Quote  Post ReplyReply Direct Link To This Post Posted: Dec/07/2018 at 1:07pm
Originally posted by brownspirit brownspirit wrote:

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


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.




Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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