Very good heads, they compare right up there with 781's or 049's, they might have a tad less flow at higher RPM's but you'll never know if it's not an all out race engine. The would benefit from 2.19/1.88 valves, but it's not a necessity. Have them CC'd though, I know of a set that actually CC'd at 122 cc's....check them first, that can make a pretty big difference in your C/R...but overall, grab them if the price is good. John