I have both slant head and straight plug engines, I cant tell a dimes worth of difference in the power level between the two really, the combustion chamber on the slants is smaller which would cause an increase in compression, but my " lower compression" straight plug engines run and pull just as well and seem to actually run a bit smoother than the slants, I say either one is as good as the other and like it was mentioned, the slant comes in handy if there is a clearance problem with the straight plug engine, but unless you are putting the engine on a small frame bike it isn't a problem most of the time in my experience, I have MT with straight plug engine and a beach cruiser with a straight plug engine and they both have plenty of room for either one.
Originally Posted by donphantasmo
OK, so I'm definitely getting a RAW engine. Which one is better, the slant or the regular? What's the big difference?