Ignorant, ignorant people...

[PKRWUD]

Originally posted by Rev
PKERWUD, I'm thinking of those intake lesks down at the bottom of the ports into the lifter valley. Those are tough to find for me. I had one once that drove me ugh...something...crazy. If you have a good way to find those, please let me know. Haven't had to go into that for a long time, but the last time was a bugger.

Rev

Those are exactly the ones I'm referring to. Here's the routine:

1) Hook up a vacuum gauge to the intake manifold.
2) Fully close the carburetor throttle plates by turning out the idle screw.
3) Plug up the PCV valve opening.
4) Disconnect and plug up any vacuum hoses attached directly to the intake manifold.
5) Disconnect the battery feed wire to the coil to prevent the engine starting.
6) Crank the engine and observe the vacuum gauge. From 3" to 7" of vacuum (at a minimum of 250 cranking rpm) is normal. A defective intake manifold gasket will give, in most cases, a zero vacuum reading.

Take care,
-Chris