Originally Posted by jimzz2001
What did he all do in the Tune-up? Plugs + wires, did he adjust timing? what was the cost of the tune-up?
The reason I am askng is I am only getting 5 at best going 55-60 mph. I was hoping/planning on 7.7 - 8 mpg with the easy going speeds? My 34' is running good but someting has to be wrong + it is sluggish up the hills
Sluggish up the hills indicates your ignition is really retarded so now you will need to find a "Guru" in your area that understands the "HEI" ignition and is willing to set it up to these specs....
(1)....Base timing 10*, NO vacuum connected at the distributer advance (yet).
(2)....Distributer mechanical setup to 22*-24* at 3,000 RPM.
(3) Stock vacuum advance hands out way tooooo much advance (25*) and will need to be cut back to 10*---15*.
Base 10* + mechanical 22* = 32* without the vacuum hooked up yet..
Now with the vacuum advance reconnected which while lite footing it down the flat & level road add in the 10* or so advance and when your foot is into the floor board and you have ZERO vacuum you have at least 32* of built in advance and your engine will love it.....
Please find this socalled "Ignition guru" and just ask him the above questions.......WALK AWAY if he makes NO sense......
Cannot get into the carb section YET until your ignition is setup and locked down (forever