Carb is perfectly fine for making a lot of power. You can make great gains with some side-drafts and a bit of tuning. The 20/22R hybrid motors are pretty cool and make a bit of power... and money-wise, they're not all that difficult or expensive to do. With some headwork, a 20R head on a 22R block can make for some very nice gains.oldskoolceli said:well i have a 20R, but what and how would I build up the engine??? Its carbed..