68 Orange, just a little advice from one who has tuned bunches of those Edelbrock carbs. Don't go making all sorts of jet and rod changes at the same time you'll end up way out of the ballpark. That 500 is most likely very near to what your 292 requires, at least for basic set up puroposes. I've run them out of the box on 350 Chevys with mild cams and headers and they set up good enough to be able to test drive for miles in order to decide what rods changes needed to be done. Follow the manual and work first with only the metering rods going richer or leaner as you move along. If rod changes in one direction or the other get you close and you can't get any richer or leaner by only changing rods, THEN it is time to start juggling jet sizes.
Champion plugs...... hmm. I never had really good results with them and prefer AC instead for a GM engine.
One last tip that is barely mentioned in the Edelbrock booklet is if you have an eratic idle that seems to defy any simple carb adjustments then change the distributers vacuum advance hose from the ported vacuum position on the carb to the direct vacuum position. Although it doesn't seem logical my 250 required this and I've had to run it this way on a 327 Chevy V thing too.
"ran out of room to bend the float adjustments?????" I never came even close to having that happen on these carbs.
I hope by the time you read this post you got it all sorted out. Carb tuning can sometimes be a headache.
Mike G ( 4355 )
