I am trying troubleshooting a 72 Vega engine I just rebuilt. I had a local shop do the valve job on it. It fires up OK, but it was running a bit rough. I checked spark, all cylinders getting good spark, but I noticed that when I pulled the wires off cylinders 1 and 4 that it didn't make much difference in the way the engine ran. When I pulled the wires off cylinders 2 and 3, there was big difference in the way the engine ran.
I used a temp gun and I found the exhaust on cylinder 1 running at about 200 degrees (essentially nothing), cylinders 2 and 3 at about 500 degrees, and cylinder 4 running at 800 degrees.
I am thinking that the shop that did the valve job messed something up. Maybe possible doing the valve job, and then mixing up the valves between cylinders 1 and 4. Any guess what what would cause such as variation in temps? The springs are original too, so could it be related to weak springs?
I googled a bit and found some information on exhaust temps and valve problems, but it didn't go into detail.
Thanks,
Ken