Originally Posted by
Flying Monkey
This is basically a ford vs chevy debate.
People who read a magazine will swear to the 21. Others will swear to the 28.
I personally run a RB 728 in my mugen and love it. Couldnt ask for a better motor with a 14t CB and a JP3 pipe.
Agreed. I see guys using the Jammin .21 in their truggies and they fly. Just get something with great fuel mileage, reliable, and all around good powerband.