Dan, both sides look about the same. Since I burn around 12-15 gallons of gas per 100 miles, a qt of oil in 15 gallons doesn't seem so dense if it's mixed with the fuel and air prior to combustion. Even though my TFS heads had 8,000 miles on them (on my previous engine), they received additional porting, new valve guides and seals, a valve job and new roller rockers. I doubt there is anything wrong in the heads. I will be able to put that theory to rest this weekend when I replace the PCV valve with a breather. This motor's so shiny, I can see a leak from a mile away.