No doubt this has been discussed before, but regarding camshafts: Thanks to the current situation, I finally got around to disassembling an Apache ( SMR #) project of mine. It appears to have been unmolested and simply run to death without any catastrophic failures! Yeah! I was glad to find that it has the "mythical" intake sprocket with the "A" marking and camshafts marked IN R and EX R. Actually not in bad shape, although some resurfacing might be in order. Memory fades over time, but these are the first R markings I have found in quite some time. I have an abundance of #1s & #2s IN/EX, but nothing with the "A" marked sprocket or the R designation.... So where does this set up fit into the grand scheme of RE camshafts? Any other oddities to look for? The crank feels lighter in comparison with others, so I need to get out the scales! Back in my high school days, I did buy a set of Apache cams from my local dealer for my Trailblazer ... No recollection of a special sprocket & no, I was not smart enough to save the boxes! Any Info to share?