I'm about to fit a set of 1641 pistons and barrels to my 1600 unit and possibly new heads if needs be. Which standard complete heads are the best to go for. I'm off to the South of France in 3 weeks time and will hopefully cover over 2 thousand miles so I want it to be right. What should I consider when running in the new setup as it won't get many miles on it beforehand? Should I just leave the engine alone until winter as it runs OK anyway and just fit my new Dell 36's in the meantime? Ooh, decisions, decisions.