new plug(s) and I even swapped cables AND plug into good cylinder. Cylinder pressure test didnt point to anything leaking anywhere (crankcase, intake, nor exhaust) Another 2 suggestions from the all knowing internet: Holley says ignition issue , while Vac Visual: Quick Guide to Vacuum Gauge Readings - OnAllCylinders says valve guides.....Maybe as I got new rings and now its higher vacuum is highlighting the old valve guides? I had a valve job done <1000 miles ago on this head (milled, valves ground...) not sure if he touched the guides. F it, these are press in guides with a hammer according to the FSM so Ill spend $25 on all 8. Could not hurt, Ill learn to hammer a guide in and I got 5 months to complete this truck. Really dont want to use the old head but I got it just in case. What effect will a smaller exhaust port have on overall driveability? I know the W2/Wx had a dinky looking exhaust port but they flowed like a ****.
