Have a 1981 SBC 305 with an edelbrock 1405 carb. No EGR valve and all pollution devices have been removed. Can anyone recommend the proper PCV valve to use. I've tried a few different valves and when installed they produce a vacuum leak issue (high idle) When I plug the front vacuum port the idle is perfect. When I hook the pcv to the port I can't get the idle down below 900 rpm. I know I don't have the correct pcv valve.
Pics, or a part number of the current valve you have would be helpful. Also a picture showing how you have it hooked up will get a quick recommendation.
You may try a PCV valve for an '81 305? What is your idle vacuum? Thy t******* your carb without the PCV valve hooked up. The easiest way for novice (not to say that you are one) is to hook up a vacuum gauge and then set about t******* the carb, moving back and forth then fiddling with idle speed as you go until you achieve the highest possible vacuum. if your PCV valve is causing a "vacuum" leak it is because you are not pulling enough vacuum to pull the check ball up and close off the hole.
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