Millions of engines got by for decades with a road draft tube. All engines have at least a little blowby- - -there's no way to get a 100% seal with the piston rings. Yes, stovebolts are going to make a little vapor, and (HORRORS!) maybe even drip a little from the road draft tube. If it bothers you that much, buy a riceburner with a PCV system!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!