pizzaman09 Posted Thursday at 02:08 AM Author Share Posted Thursday at 02:08 AM 1 hour ago, AnotherOldJeepGuy said: Did you put any details of this mod here somewhere? The plastic hoses below going to the left were new 6 months ago when I replaced valve cover gasket and also the hard plastic line at the back of the VC, and I have no idea where this crud is coming from. Maybe I need your mod! It was very simple, I drilled out the restrictor orifice in the back of the valve cover as large as I could safely do, I'll have to measure the dill but I used. Then I replaced the small factory vacuum line with a 1/4" vinyl tube, it fit perfectly. It still idles right where it always has at 650 to 700 rpm. The rear grommet used to leak oil profusely, the oil cap leaked and so did the front breather port. The engine now actually has vacuum on the block at idle rather than blow back into the air filter. Link to comment Share on other sites More sharing options...
llhat Posted Sunday at 08:38 PM Share Posted Sunday at 08:38 PM be sure to check that vinyl hose frequently, combustion gases may have a reaction with it. Can agree on your principle of getting more flow, that original hard plastic line is small... the Later HO versions used a much larger line on the rear Valve Cover port... there is a thread somewhere on here for that mod... I just have not attempted it yet.. It used the HO rear grommet... and larger line as well as larger nipple on intake port. I frequently remove my small line and spray brake keen or choke cleaner through it... Link to comment Share on other sites More sharing options...
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