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Re: Air cap for L31 - which type?
That’s the hook up for a breather hose.
I’ve used them before with a couple of plastic 90 degree elbows and some 5/8 inch hose. Run to the grommet in the valve cover.
You can use just a breather if you want.
All you’re looking for is filtered air into your motor to combine with the fumes and out the other cover with the pcv valve.
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