sorry for the lack of info, 461 with 215 heads on flat tops, 2.19/188 valves with I am guessing about 9.5 to 1 compression, cam is a just an rv cam that makes about 16" of vac currently. they actually have a tear down rule in place in my class, so it may be measured eventually if I keep winning. I asked the same question about how they would know and all I was told is " we will know".