So I am trying to figure out the optimal PCV valve to use for our 216/235/261 engines. There is a significant difference in them. To test, seal up the valve cover cap hole, test with a vac gauge through the dipstick tube.
The V-237 Valve reads about 2 inches on the vac gauge.
The V-178 Valve reads about 5 inches on the vac gauge.
The V-112 Valve reads about 10 inches on the vac gauge.
According to
http://www.aa1car.com/library/pcv.htm it says the optimal reading is 1-3 inches. So, my testing shows that if that article is accurate, the V-237 is the best choice.
So do you experts out there feel this is valid? Is 2 inches sufficient to evacuate the exhaust gases?
