Hi All, I'm new here to the forum and not familiar with the process for performing a search on the subject so if someone can help me out with some instructions I would greatly appreciate it. Meanwhile, I have a '55 Mercury Montclair 2dr Hardtop with the original Holley 4000 Teapot and Merc-O-Matic tranny. I purchased this original 6 volt system non running car back in late June of this year and since then have been slowly waking it up from a long, LONG hibernation. I have no idea how long it sat up but the gas tank was a nightmare to de-rust, prepare and reseal. The next step was to purchase a quality kit for the Teapot from Daytona Carburetor and perform a complete and thorough rebuild including fabricating new primary throttle shaft bushings and adding a new vintage Carter canister type fuel filter. l have replaced the plugs, points, condenser, cap, rotor and coil and have new plug wires standing by. The car has a new water pump, thermostat, fuel pump, voltage regulator, starter solenoid, battery, battery cables, belts and hoses and I just finished fabricating new steel fuel lines and vacuum lines. The car now fires right up and I have logged approximately 150 to 175 miles onto the odometer since wake-up. My tester was giving me a fit when I was performing the compression test however ultimately all cylinders were confirmed as being within the 130 to 140 lb. range. I am now at the point of wrapping up the engine work which brings me to the point of my subject, rough running off idle. The idle is absolutely perfect and the sound of the 292 at the duel rear exhausts is as sweet as it gets. Anything above idle turns into what almost sounds like a V-8 running a slightly modified cam. Driving characteristics include a slight off idle hesitation (not noticed when operating throttle in neutral) and a noticeable but not drastic surging can be observed at cruising speeds. Otherwise, from a wide open start the throttle response is impressive and the 292 is powerful enough to break the tires loose and at cruising speeds the combination of the transmission downshift and carburetor secondary's opening up make the little V-8 feel like a larger engine. The air fuel mixture screws respond very well to adjustments and I honestly do not believe that I have any vacuum leaks or that the carburetor is dripping any raw fuel into the intake. So here I am looking for ideas from others who have experienced the same off idle roughness and what the ultimate cure was. (Forgot to mention that at some point the distributor was changed out for a single diaphragm vacuum advance model most likely from a '57 Ford)
Thanks in Advance,
Gary T
Starke, FL.