Thanks guys for the replies - Another question though - When you say "rebuild your engine" - What do you literally do (sorry if I may sound stupid - just making sure) and is there any additional "rebuilding" when you have certain mods on? I mean I'm not looking for cheetah engines that are big bored to like 500 but staying at a 350-400, ported, pipes, bigger carbs, reeds, K&N filter, etc.
Thanks