73 340 Compression Test interpretation help

If you decide to install the factory type pcv with a grommet thru the valve cover, be sure to install a flat metal plate (baffle) on the underside of the grommet hole where you install it. The stock pcv grommet works fine in the blind holes provided - by the way. There is no baffle, and you do need one in this case. There are bosses there that are either already tapped for small screws or can be tapped. Use some locktite on the threads of the small screws if you put a baffle in.