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Patrick L. · 05-10-2015, 07:37 PM

If the compression is good and the valves are not sticky, then it kinda sounds like a vacuum leak if the ignition system is in good shape [ no carbon tracking in the cap, etc]
How did you adjust the valve lash ? And what are they set at ? Original lifters were not adjustable requiring the seat or valve stem to be cut. Upon many rebuilds adjustable lifters have been installed which means the head does not have to be removed for adjustment.

05-10-2015, 07:37 PM	#3
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: #3 & #4 cylinders If the compression is good and the valves are not sticky, then it kinda sounds like a vacuum leak if the ignition system is in good shape [ no carbon tracking in the cap, etc] How did you adjust the valve lash ? And what are they set at ? Original lifters were not adjustable requiring the seat or valve stem to be cut. Upon many rebuilds adjustable lifters have been installed which means the head does not have to be removed for adjustment.