hmm..intermittant ? Well first thing I'd do is verify TDC on balancer . YOur intake valve opening is of no concern , unless you are degreeing a cam . Once TDC is verified . Check ignition timing , watch it, does it change as engine idle goes into it's fits? If so check dist bushings. I have seen some valve adjustment problems on these . If you are on the edge of the adjustment limit it may be hanging a valve open slightly , would account for low vacuum and rough idle . 16 inches depending on the cam is not out really terrible . But if it's all stock, could be higher . I've raced small blocks for years,if it was here in shop I'd have it figured out in less than a six pack ! lol What year is this motor ?
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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