Okay, I got a 347 stroker and I noticed a spot that was leaking under one of my valve cover gaskets. So I went ahead and bought new gaskets. But before I replaced the gaskets I noticed that my valve cover bolts wasn't tight. So I basically went out for nothing and get new gaskets. Anyways since I couldnt return them, I went ahead and changed the gaskets. And I tightened all of them pretty tight. And I noticed that I still have an oil leak at the same valve cover gasket at the same place. Why is this? I also used cork gaskets, did I tighten them too hard? How hard should you torque valve cover bolts/
cork gaskets have to swell use rv gasketseal around bolts and corners
I have see one time that a car had blown valve cover gasket. It leak very well and Touch on Exhaust Madifold. It cause fire. Engine is High milages. Engine make blow by through piston and cylinder. Bypass gas cause Press gaskets or seals to make oil leaks. Other thing is loose vaccum for brakes. It make hard to press brakes. Like air leak. OR Rubber valve cover gasket getting dry up, and start brittles. Its ten years old, So go and replace valve cover. If you know how, That will be great. Do it asap Than Sorry.
You never mentiond what type of Valve Covers you Had ..Aluminum or Stamped steel.... I am supposing that you have a Chevy engine...Now the FIX......I get 10 points if I get it right,,,,, Providing you scraped and cleaned All surface area; here it is..... If it is a Stamped steel Valve cover then you have to Flatten with a Hammer the area where the bolt holes are on the Valve cover.. Now Go to an Auto Parts store or a Performance Parts warehouse and ask for an EXTRA THICK valve cover Gaskets ,Usually made by Fel-pro or Mr. Gasket...they are made out of cork or Rubber.. They even have a gasket that Sandwiches a Thin Sheet of metal between two Neoprene Gaskets ..I think it is made by The same companies...I prefer this....I use to Build Race Car Engines and operated a Auto Machine Shop... Good Luck and God Bless...
