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Just my two cents, (doesn't mean I am right!) Most PCVs draw air from the valve cover to the back of the carb/intake. Any blowby would be ingested back into the engine. Don't see how this could get dirt back into the engine. Oil yes, dirt no. Dirt track cars (Sprint etc) mostly run breathers and just vent out any crankcase pressure. Any negative pressure would be sucked directly through the breather. Most are tiny air filters that are washable. On a dry track, I think these engines see more dirt than a tractor. So running this way, again dirt is filtered out, if you keep the breather washed. Drag cars run actually run vacuum pumps to constantly pull air out of the crankcase. Those are the three ways I have seen crankcase pressure dealt with, spent most of my time around drag cars. Those vacuum pumps work but not real practical for everyday plus $$$. It sounds your setup is similar to a car setup. I dont see why it wouldnt work. Sorry so long!!! Rick
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