Both sensors should be tested with a labscope or with a Tech 2 IMO. If it was the chain wouldnt the results be really screwed up since the valves wouldnt open/close at all?
Could you take the plugs out and turn the motor by hand and see if all the rockers are moving as well? Was the compression test low on all or just one cyl?
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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