I set the timing in my truck to 0* on the #1 cylinder. I then checked the timing on the #4 cylinder and it is about 1-2* more advanced than #1. They should both be the same, right? Does 1 or 2* mean that I should replace the distributor or is that ok? Is there any way to check cylinders #2 and #3 accurately without changing the belt pulley?

 

The best way would be to set #2 and 3 cylinders to TDC and create another mark on the crankshaft at 0 degrees. What you speak of is normal though. From what you've said, there's nothing to worry about.

 

Thanks for the response. What should it read to check the mechanical and vacuum advance? I have seen before where an engine is revved to 2000 RPM and the timing is suppose to read so many degrees more advanced than at idle speed. For example, if the timing is 0* at idle, or 700 RPM, then it should be something like 12* at 2000 RPM. My truck is a 1987 22R carbureted with California emissions.