ORIGINAL: j_blaze
ORIGINAL: Foxy
It'll be great for both. One of my favorite engines I ever had. Very strong on the bottom, runs cool as a cucumber, reasonable top end, lasts for gallons and gallons, easiest engine I ever broke in and tuned... Can't recommend it highly enough as a top sport/semi race engine. It'll give many race engines which cost twice as much a good run for their money.
+1, rb's are pipe picky sometimes, mine likes the jp-4. good power and run time.