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Do you guys have any pointers or tips to help keep this neck from leaking between the gasket?

Form-A-Gasket Type 3 Aviation

Affectionately known as the "Brown Shit"
It's in the same family as Anti-Seize...It works awesome but gets on everything and is a pain to get off. I have never had a failure with it. Use lacquer thinner to get it off your hands etc. For your shiny engine, use sparingly on all (upper & lower) surfaces.

Murf wrote: ↑Wed May 28, 2025 5:23 amForm-A-Gasket Type 3 Aviation

This. It is a mess you need to clean afterwards but guarantee it works.

From FB I got all kind of suggestions from using Type 3 Aviation as well as others. The base area where the neck sits on the head was not too smooth. One suggested I take it to a machine shop to have it milled smooth. Sorry but I am not taking the head off now.

I decided to use JB weld metal filler to put on the head where the rough places were and sand it down. The I decided to go with the Indian Head shellac. Right now I am letting it cure as long as I can before I put coolant back in. I will report back.

Hope it works. The type 3 would still take care of it. It has the consistency of extra thick molasses.

Straight-edge your mating surfaces to confirm they're smooth might help too.
Gary

Type 3 is the bomb for that.
And here is a tip straight from Permatex for clean up. Use isopropyl alcohol. Instantly takes it off your hands. Easily cleans up extra pushed out around part. With a soak, easily cleans the surface when you take it apart years later.
After decades of using it, I can attest to its effecacy.

If JB Weld and Indian Head Gasket sealer doesn't do it, use Shoe Goop. It's great on parts that are warped, it will not leak and when taking the parts apart, it splits the gasket, extreme holding power.