77Astre455 wrote:77Astre455 wrote:pcguy wrote:Distributor vacuum is plugge/disconnected. Heading out to get a camera. If it has domed pistons along with the unidentifiable cam, I'll probably replace the engine with a 383 crate. Any recommendations?
If vacuum advance is disconnected and you have 34 etc by 2700 the previous owner probably set it up that way. That is NP and is most likely not holding you back, except for a little worse MPG on the street. I wouldn't go spring for a 383 till you have that one running correctly. You could have the same issue with any hi-po engine if fuel psi is dropping off at RPM. But on other hand if your expecting to run well into the 11 second ET range your gonna need more than you have now. As in better flowing heads, stall convertor, more gear, bigger better tire, etc.
RC
Another thing to check is make sure gas is not trickling inside carb at idle. You shouldn't see any gas at idle. You could possibly have trash in needle and seat for float in front carb bowl/(s). That will make it run rougher and appear to have bigger cam/ or seem too rich on jets. I doubt its jetting on secondaries because that carb you have probably has a rear metering plate instead of rear metering block with jets. (I'll look at pic again) Also check float level with side screw on carb bowls while not running. Should be right under screw hole. If trickling gas your sooty exhaust and brown plugs can be fooling you thinking your too rich. Typically when too rich... at part throttle cruising it will kind spit/sputter/miss(not run clean and smooth). I recommend one day changing carb to a 750 dual feed or a double pumper so you can tune/ change rear jets like the fronts. An 750 dual feed vac sec is cheap and you can add a rear metering block with jets but you will need a double pumper longer dual feed line. You can change vac diaphr. spring for secondaries or you can make it mechanical secondaries by using the small screw on linkage on drivers side. I doubt your engine is too lean in secondaries from what I've heard but that will hold you back too. If in doubt take carb apart and clean and blow out with air especially on secondaries with the metering plate. It will tend to mess up gasket when you pull it apart.
RC
Just looked at your pic and your carb does have a rear metering plate not rear metering block with jets. You have calibrated holes on secondaries acting like jets which could have trash or old gas residue. If all else fails take carb apart and clean and blow out with air. Also on a long shot, take air filter off on a test drive and make sure your air isn't getting choked off. Good luck, don't give up, and keep wrenching.....hehe.
RC