Bob, it ain't leaking. When I emailed Keith Black (those are the pistons I'm running) they said that clean plugs indicates the oil is coming in through the carb/intake. Today, I purchased a plug for the vacuum port on the carb and a breather cap to replace the PCV valve. That will at least eliminate one potential culprit. The pisser is that one of my buddies here has basically the same engine and he doesn't use any oil. I'm wondering if all the porting that was done on my intake and heads is creating too much vacuum. I'm running a Vic. Jr and a Mighty Demon BG carb. I'm running out of ideas. Pretty much everyone is stumped. Worst case is to pull the motor and start all over again. It's all polished and dressed out for show. I hate the thought of it having to be taken back apart.