Hello, I'm having problems getting my new motor to idle. 72 cadillac 500, .020 over,,507ci. 9-1cr,, comp RV torque cam,, .540 lift, duration intake 233,ex 235,,,,lobe seperation 112. Factory Ex. manifolds. Edelbrock 2115..This is for my GMC motorhome. Its sitting in my shop in the frame, hooked up to the transmission,differential,radiator. Hooked up a temporary contol panel with a throttle that can be locked into place. Also installed an oil pressure gage,water temp, fuel pressure and AFR. Fired up ok and ran for 20 min. at 1800 to 2200 rpms. Small problem with glowing ex. pipes but thats what happens when you leave out the idle air screws. in trying to set the idle I had costant problems with flooding. 1/2" of gas ontop of the butterflys. Had 8.5 lbs with a factory pump. Switched to a .125 needle and seat. Installed a regulator and gage,,,4.5 to 5lbs. Factory manual calls for 8 degrees but it won't hardly idle. have to crank on the idle screw and opon the primarys some. 8-10 inches of vacume. very rough. more advance,,,12 or 14 degrees lets me back of on the idle screws,,,12 to 13inches of vac.,,,,, still idles rough. 700 rpms.Responds to bliping the throttle and it takes alot of sudden throttle quickly to raise the APT. Sprayed ether and carb cleaner around the manifold and carb looking fo a leak. Nothing. IR temp gun shows all cyl. head passages the same temp.,,320 range. Made a smoke feeder out of a paint pressure pot and injected it into the manifold to see if I had a large leak in the valley. Never came out of the rocker covers. 165 to 175lbs. compression. Rmoving one wire at a time makes it idle rougher,,None make" zero" diffrence. It idles better rich,{screws out 5-8 turns} 12.5 AFR on gage. Idle air screws will change AFR to 14/1 but it idles worse. Removing the plugs after warmup and idling, very wet. Checked zero mark on crank hub twice,,and came shaft using the "intake centerline" method. After warm and idling I removed the carb twice and found fuel around the well plugs. Tested for leakes,,none found. Filled bowl with penatrating oil ,,overnite,,no leakes.
Idle tubes .037
Idle channel restrictions .046 loose,no go .052
upper air bleeds .070
Lower air bleeds .055
Idle screw holes .059
Idle bypass air .108
Main air bleeds .052
Jets 73
Rods 54 V
Carb# 17080212
14444 GPW
Carb is off of a 1984 P30 cassis motorhome.,, used a kit from you. Hpe I didn't miss anything, help.,,,,,,,P. Leavitt.
