– The Blacktop has a bigger quantity airbox. The opposite key variation is the Silvertop airbox features a horizontal split between the lid and the base, as such the bolts are wound from the major down.To allow for the real difference in cam belt tensioners the oil pump castings are distinct among the engines. They can be interchangeable if all o

The blacktop has lighter internals which can be also weaker, but it's a bit a lot quicker. No harm if you're not doing any massive mods, but any pressured induction and you will be needing to uprate the blacktops internals.Stroking the crankshaft to some utmost 81mm will keep the RPM capability intact. Bores might be brought out to 83mm, but check