The A10 plunger build that I'm working on is not going to be standard stock. On saying that, I am not destroying or customising any original parts that I have, just making do with what I can find. I want to plumb the oil pipes with copper pipe and brass fittings (Brazing the joints ) But I would like to join the flow and return pipes between the gearbox and timing case with Prestex couplings, Who thinks that this is a BAD idea rather than using flexible pipe that would limit any vibration cracks ?