Joining Atlas crank cases

jms

jms

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I’ve just completed a crank regrind, a cylinder hone, and a valve job on my Atlas engine. Getting ready to start building the engine. I’m curious what is favored by most as a sealant when joining the cases? Thanks
 
I always use wellseal on crankcase joints
But opinions will vary a lot
And there's a lot more modern stuff available now
 
Joining Atlas crank cases
 
I've been using this since the late 60s, has never failed me. Easy cleanup with denatured alcohol and is still pliable and easily removed 50 years later.

Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant​

Before the attack: No, it's not FAA approved, it's a US MilSpec approval and it's designed for the machined join surfaces in engines.
 
I used Permatex Form a Gasket on my Atlas way back in the 70's when we didn't have the internet and modern sealers . The old standby has stood up well for over 50 years and 50K miles.

Slick
 
Whatever you use, use it sparingly with a thin coat. You don't want it squeezing out on the inside and getting into any oil passages. The Grey colored sealants look better aesthetically if they happen to squeeze out a little on the outside of the cases. I use the same product on both the cases and as a base gasket. No leaks. Permatex Optimum 27036

I always let joints dry for 24 hours before doing anything else with the joined part. Being in a hurry is a recipe for disaster unless you are pitting at a race event and have no choice but to hurry.
 

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