[ss3011]

Thanks for the information . That early post has lots of good info. It looks like depending on how the exhaust flows, and how much heat transfer you get in the port, will determine what material you can fill the crossover with. Zinc alloy melts at around 750 degsF, and aluminum melts at around 1220 degsF. I think I will try melting down some old pistons, and see how that pours into the crossover. Thanks again !