Returning to the head.. again..

[Shadoobie]

Hello everyone, just replaced my head gasket under your advisory and found that one of the head bolts was loose when taking the head off. The same bolt sheared off when I went to put the head back on, so I decided to buy all new head bolts. We never re-tourqued the head when we took it off the first time, so this doesn't really surprise me. I put everything back together and had no problems, even driving the car (very gently) 250 miles or so to a car show and back over the weekend. On Monday, I drove the car to work and found that it suddenly ran rough, just like the first time, except with the added bonus of smoke spewing out of the pcv hose. No valve clatter this time though, as well as no oil in coolant or vice versa. I got it home and ran a leak down test. I found that cyl. 1 is leaking from the exhaust, cyl. 2 from the intake, cyl. 3 from the exhaust, and cyl. 4 seemed fine. Then I ran a compression test, with the results reading thus from 1 to 4: 170, 165, 50, 150. I called up Matt Brannon and he suspected that the valves have bent or lost their seal somehow, which makes sense. However, all the timing marks line up perfectly for the cam, crank, and aux shaft. So what's going on?! And how?

[So Cal Mark]

what percentage of leakage do you have on the cylinders? No cylinder seals perfectly but obviously #3 is a big problem

[Shadoobie]

what percentage of leakage do you have on the cylinders? No cylinder seals perfectly but obviously #3 is a big problem

It ranges between 60 to 85 percent.

[Shadoobie]

I also noticed that cylinder 4 causes air to escape from cylinder 2 when tested. Is that a result of overlap of valves opening at the same time between cylinders? How does that even happen?