[Walt Fricke]

I'm with Andy. The spec is 1.1 to 1.4, so both are within tolerance. I like to get the two a little closer to each other, but I don't think it is anything to lose sleep over, or to go to the trouble of opening up a chain housing and resetting one side. You might reset the valve lash on both #1 and #4 intakes and recheck the valve timing to see what that does to this spread.

For that matter, why not check all your valves' lash? Since you think something is amiss, this is a good place to start. You could even check each valve for maximum lift, which would give you some idea of a cam lobe wearing. Though I think that a visual inspection of each cam lobe (which you could do as part of the lash setting) will tell you, and one doesn't hear much about excessive cam wear absent some disaster, like a blockage in a spray bar. If you have such a thing you will see it at once.

Have you done a leak down? That's a nice, non-invasive diagnostic tool. Checked injector outputs?

Walt Fricke

Walt Fricke