Technical > Matt Shaff's Engine Shop

Lets talk head gaskets

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ricardo1967:

--- Quote from: dusterdave173 on May 14, 2015, 11:17:29 AM ---Copper leaks water ....best way I have found is spray couple coats of Hylomar spray  expensive like $60 a can expensive but it works --In normal drag cars a very low pressure radiator cap helps not sure how that works in dragster--MLS gaskets only work if surface is prepped with correct RA which is smooth compared to the old surface left by Storm Vulcan type surfacers--most shops these days have good modern surfacers that will produce correct RA finish--MLS on rough surface leaks worse than copper
I avoid copper unless it is blown application   MLS is the trick if surface is right
or...smear RTV around each water hole and rock on! Repeat as needed  :)

--- End quote ---

Dave, I had sprayed them with K&W Copper Coat Gasket Sealer (http://scegaskets.com/product/sce-gaskets-part-number-g1612/, but it leaked (BTW, it was a pain to get it apart later!) I should try Hylomar spray next time, thanks for the tip.

dusterdave173:
Copper Coat is almost always misunderstood--It is NOT a sealer--it was invented to spray steel shim head gaskets that were used in the way back days by many --it had the copper to aid in heat transfer
between gasket head and block
It is great for that but otherwise a mess IMO
Hylomar is what all the circle track guys use when they reuse a MLS gasket for 3-4 times Easy.
Good Luck!!--I am not aiming to be a know it all I just build several engines a week and run / dyno them and I raced my A$#% off for last 20 some years--I have screwed up about every way possible and the easy ways several times--just passing along if I think it will save you from one of my many mistakes.

ricardo1967:

--- Quote from: dusterdave173 on May 14, 2015, 04:43:06 PM ---Copper Coat is almost always misunderstood--It is NOT a sealer--it was invented to spray steel shim head gaskets that were used in the way back days by many --it had the copper to aid in heat transfer
between gasket head and block
It is great for that but otherwise a mess IMO
Hylomar is what all the circle track guys use when they reuse a MLS gasket for 3-4 times Easy.
Good Luck!!--I am not aiming to be a know it all I just build several engines a week and run / dyno them and I raced my A$#% off for last 20 some years--I have screwed up about every way possible and the easy ways several times--just passing along if I think it will save you from one of my many mistakes.

--- End quote ---

Thank you Dave. I'm very appreciative for folks like you sharing your experience here.

FEDNV:
I see JE Pistons now sells MLS head gaskets.  Anyone have any experience with them?  The machine shop I have my work done at is a JE dealer and they were pushing them.  After looking at what is available it looks like I will be going with MLS and from what I have been reading most guys really like the Cometic brand.

masracingtd1167:
The Fel Pro MLS gaskets are very good You should have no problem with them !

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