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Mine is 3/75. You'll see the PCV valve (the one with a small ball and spring in it) on the front of the drivers side rocker cover which then goes to the base plate of the quaddy. The rear of the passenger side rocker cover has the larger hose that attaches to the filter in the aircleaner. As you can see I made a bit of an error about 6 years ago where I wanted to keep the original transfer on the aircleaner but wanted to clean-up the rest of it with paint while I was getting the heads done-up for their 31 year birthday. Wasn't aware I could just have ordered anothery instead of trying to mask it up.... Wasn't into eBay etc then....

Hope that helps. I'm not too sure but think the change in HJ series was around August-September 1975?

Regards,

Dave