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 - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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