You will feel nothing at each individual intake port. Blocking the outside high speed ports will do nothing if the center idle port is open. At cranking speeds with all three blocked you might see a 2 or 3 PSI difference in negative pressure. Crank case pressure in a running motor is only 4 or 5 PSI. On the other hand a compression of 65 PSI is border line. I would rather see 75, but that may depend on the length of the hose on the compression gauge. . . . 🙂
