Yet another vote for the Nova N21BF. I havn't used one myself (yet) but I have seen em run and they make great power for a budget engine.I ran most all of last season with the SH .21 Pro 2004XP. This was a very good engine for me and I abused it in a big way
.I had it temping at 400+ a couple times!!!
.I even was once subject to someone in the pits on same channel turning their radio on, which hit mine. Car took off and buried itself in the woods...was probably 15-20 seconds before I got to it, running WOT the whole time. Let 'er cool down a few minutes, and she would start right back up.Got approx 7 Gal through it...could have gotten a lot more...front bearing starting pissing bad on me. I decided to try to replace it and ended up damaging inside the crank case.