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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><pre>[[[<span style='font-family:"Courier New"'>I think you'll be okay if you plug the extra holes in the air cleaner and just run it this way. With the original setup, this would draw clean air into the heads and flush out the case, keeping condensation to a minimum. This would be especially useful in cold weather.]]]<o:p></o:p></span></pre><pre><span style='font-family:"Courier New"'><o:p> </o:p></span></pre><pre><span style='font-family:"Courier New"'>I don’t understand this, Jim. If his pcv is drawing air out of the crankcase, the air has to be replaced, right?<o:p></o:p></span></pre><pre><span style='font-family:"Courier New"'><o:p> </o:p></span></pre><pre><span style='font-family:"Courier New"'>When I first got my ’72 up and running, I too did not have the ports in the heads and I installed brake line sized ports in the valve covers to allow air in. I was flinging oil out the fan end of the motor at the time, and this list told me I needed larger air ports to let more air into the case. I didn’t understand why, but I then installed about .500 diameter ports into the valve covers and my flinging oil problem was solved.<o:p></o:p></span></pre><pre><span style='font-family:"Courier New"'><o:p> </o:p></span></pre><pre><span style='font-family:"Courier New"'>How can Jacobs pcv system be okay to run with no way to let air back into the crankcase?<o:p></o:p></span></pre><pre><span style='font-family:"Courier New"'><o:p> </o:p></span></pre><p class=MsoNormal>Dave Pallo<o:p></o:p></p><p class=MsoNormal>'72 Square ~ Elwood<o:p></o:p></p><p class=MsoNormal>Fairport, NY<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><pre><span style='font-family:"Courier New"'><o:p> </o:p></span></pre><p class=MsoNormal><o:p> </o:p></p></div></body></html>