1972 Dart Swinger slant six to 340 upgrade

Jason1972 said

Here are some more photos of the melted down piston in the crossover port. (...)

Click to expand...

If you don't mind my asking, how did you block off the port so you didn't fill the whole thing with aluminum? Did you use some sort of putty, clay or plaster?

edit: Oh, never mind. Now I get it. You poured from the exhaust side. Sorry.