It was a very simple modification- - - -unbolt the road draft tube, and bolt in a cone-shaped adapter with a 3/8" tubing nipple on it. Then run a piece of rubber vacuum line forward beside the valve cover toward the carburetor and install a PCV valve with tubing nipples on both ends. Remove the pipe plug at the rear of the carburetor and install another 3/8 tube nipple and a second piece of hose, or install a T fitting in the power brake hose to draw the vapors into the intake. The final part of the conversion was a sealed oil filler cap with a hose nipple on it, and a fitting that was installed on the underside of the air cleaner housing to draw air from the "clean" side of the filter element to complete the closed loop system. There were some stiff fines handed out to people who refused to complete the conversion, assisted by roadside spot checks done by the same CHP enforcement goons who harassed truckers about too much Diesel exhaust smoke. Car dealer parts departments and auto parts stores sold the whole setup as a kit, and untold hundreds of thousands, maybe millions of them were sold. The "California Air Resources Board" (Yep, C.A.R.B.!) was a very unpopular bunch of bureaucrats back then!
Jerry
