Reply to "Valve in new engine not seating"

@LeMans850i posted:
No leak is what it should be with springs installed… you can skip all the vacuum testing and blue paste and whatever…
It has to hold gas…

Roland and Doug,

The leak down test showed an intake valve and an exhaust valve leaking on that head. Now that the head is on the bench, the gasoline test shows the intake valve sealing and the exhaust valve leaking. It appears that a leak down test is a more stringent test than the gasoline test. Have you come across this before where a valve passes the gasoline test and then leaks once installed?

10/9/247:29 AM

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