I'm thinking about building some shorty style headers for a BBC in a jetboat.
I'm going to use some thick-wall stainless all TIG welded together.
These are going to go through the transom. I have tons of room in the engine bay and I'm wondering if the primaries should go up like most of the ones I see or should they point downward?
What size of jets should I use and how should I situate them?