Some time ago replaced my carter AFB for a Street Demon 625 CFM in my 360 SB due to a very rich or very lean condition, now I'm stucked with a similar problem with my new carb
My engine has a comp cams 262H XE camshaft, new timing set, stock pistons, stock heads and stock exhaust without any emission control system
I'm running the smaller main jet and the biggest metering rod that holley makes for this carb but my car is still running rich! I did the smoke test two weeks ago (smoke test is mandatory for any car in my country, doesn't matter how old it is) and the guy told me that the car was running rich while idling (9.7% CO2 @750 RPM) but is fine at cruising (3.2% CO2 @2250 RPM). Checked my spark plugs and all of them are black or dark brown but yesterday went to a travel and after 90 minutes going up hill the car started overheating, removed three spark plugs and all of them were white (very lean condition I suspect) I drove for another 20 minutes out of the hill and once I arrived to my destination checked the spark plugs again and 6 were black but the electrode was white and the remaining two were completely black
So I don't know what else should I check, my initial advance is 12º BTDC, I don't know what is my total advance (my timing marks only goes from 10ºATDC to 10ºBTDC), checked for electrical problems and tried GM HEI ignition system and mopar ignition system without any difference between them
My engine has a comp cams 262H XE camshaft, new timing set, stock pistons, stock heads and stock exhaust without any emission control system
I'm running the smaller main jet and the biggest metering rod that holley makes for this carb but my car is still running rich! I did the smoke test two weeks ago (smoke test is mandatory for any car in my country, doesn't matter how old it is) and the guy told me that the car was running rich while idling (9.7% CO2 @750 RPM) but is fine at cruising (3.2% CO2 @2250 RPM). Checked my spark plugs and all of them are black or dark brown but yesterday went to a travel and after 90 minutes going up hill the car started overheating, removed three spark plugs and all of them were white (very lean condition I suspect) I drove for another 20 minutes out of the hill and once I arrived to my destination checked the spark plugs again and 6 were black but the electrode was white and the remaining two were completely black
So I don't know what else should I check, my initial advance is 12º BTDC, I don't know what is my total advance (my timing marks only goes from 10ºATDC to 10ºBTDC), checked for electrical problems and tried GM HEI ignition system and mopar ignition system without any difference between them