Engine firing order 1-3-7-2-6-5-4-8 which bank is cylinder 1 on?

That firing order (1-3-7-2-6-5-4-8) is typical of a V8 engine with a left bank cylinder #1. However, this is a convention and could vary depending on the specific engine and manufacturer. To be absolutely certain, you need to consult the engine's specific documentation.