I don't really know where to start here, so I guess I start with what I've done to my engine so far. It's a '92 H.O. roller block that I have put a e303 cam, some trickflow valve springs, and now was swapping some gt40p heads and a new intake on. Anyways, I got the engine all back together with the new heads and started it up for the first time. After filling it with coolant and setting the timing I could hear a very harsh chirping noise from the passenger rear of the engine. I pulled the valve cover to see if it was hitting there, but the noise was still there. While at the valve train I checked to see if all the rockers, which are stock, were tight, all but one was. I replaced the pushrod and rocker with one I had around and it tightened up.
After that I listened to the chirp some more and thought it might be a spark plugs jumping to ground, so I started to unplug wires. I started with number 4 plug wire and when I unplugged it the chirping stopped, so I reseated the wire to the plug but the chirping was still there upon hooking it back up. Now I started to mess with the timing thinking it may have been pre detonation, so I rotated the distributor all the way clockwise that I could and I got the chirp to disappear from idle, yet it was still there in higher rpms. By now I was getting frustrated at the noise, maybe it was a compression leak, so I tried to test the compression but I could not get the tester in the plug holes I wanted with the headers the P.O. had in there. I did get cylinders one and three tested at 100 and 110 PSI, respectively. Without being able to test compression with a gauge on cylinder four I decided to fill the cylinder with air and listen for leaks, which there was one but I decided after I pulled my heads again that it was just coming through the crankcase. So with the heads off I looked at the head gasket and saw no signs of leaks anywhere.
After all this was done I had another thought that this may have all been an exhaust leak with the metal gaskets i reused there.
Could it be possible that it was in fact all along the exhaust gaskets, however I don't see how that would change with the changed timing or pulled spark wire.
I really don't know what else it could be, but I'd really appreciate some help from you all.
Thanks in advance.
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