[Mark Yacavone]

I don't recommend doing it like the video shows on a Stocker..God knows, you wouldn't want to make grinding marks in the port area ..You'd have to hide them.

I've done maybe a 100 sets for engine builders around here.
I make little metal tabs that are the shape of the passage opening down in the port. I leave a little tail on the tab that I bend and prop up against a 5/16 bolt in the guide. Alternatively, you can used cotton balls, soaked with P of P . stuffed down in the port.
I fill from the level port side. If you pour too much, just knock it down with a grinder, and mill the rest when you skim the intake side.
I don't pre-heat anything. .If there's a leak ,it'll fill up with carbon before long.. It's not that critical.
As long as you don't blend the plug into the bowl, it's legal. Leaving it back a tad doesn't hurt anything.
I just use old pistons or aluminum scrap
I haven't tried the zinc, but i might. It might take less heating gas. The price of oxy/acety keeps going up like crazy