Im mainly a sinle cam kinda guy, hence my H22, But the comp. ratio vs. volume per per cc is profound, From My personal experience no more than 5-7 lbs. And I stand to be corrected But i stand true. I cranked a 11-12 lbs ond poped it.
But Just a redneck putt'in his 2 cents in. Good Luck
And slowerthanyou is on the money