junkscouts
New member
It’s a 1973 1110 4x4 pickup 392 w/ auto trans dump bed with less than 50,000 original miles. The carb is a list #6777 (448668-c91 0413) metering block is a 6779. The truck sat in a field near san francisco for 10 years before the original owner gave it to me. I drained the tanks and the gas was green as was the truck until I washed all the moss off it, now it’s white. Anyway I had the carb rebuilt by a local shop at that time.
The problem I have with it is it sputters when going up hills under load to the point of barely moving. Shifting into a lower gear to raise the rpms seems to help somewhat. It also starts to run hot when it sputters, but it’s just when going up hills, doesn’t do it on flat or down hill even at wot with a load. The rest of the time it seems to run great, but it also had an off idle stumble which I now realize is probably an accelerator pump problem.
I never drove the truck much, just dump runs. After a couple years I had the carb rebuilt again by a different shop that successfully rebuilt several others for me, but it still had the same problem. The exhaust is very rusted from the bottom of the header pipe back and I doubt any is actually making it to the mufflers, so I was starting to suspect scavenging. I then gave up on it and it’s been parked for the last 4 or 5 years.
I’m trying to get it going again. Fuel line out of the tank is now plugged so I hooked it up to a gas can and tried to fire it up, but it was only getting gas in the drivers side venturi and none from the accelerator pump. In the last 5 years I have started rebuilding the carbs myself, in fact I’ve rebuilt 3 or 4 2300s in the last month very successfully and one 4160 a little while back, so I pulled this one apart and the primary bowl was gummed up with lots of orange “varnish”, the jets were even clogged, but the rest of the carb was clean as a whistle.
The weird thing (see picture) is the passenger side holes were sooty compared to the drivers side, so to me it’s been popping on the passenger side only. Can that be caused by the carburetor or should I do a compression test to make sure things are ok on that side? I probably will anyway, but I thought I would ask and see if anyone has ever seen that before? It seemed odd to me. I’m also posting a picture of the old gaskets in case the last guy used any wrong ones and someone recognizes that. I have the Holley kit and there are a couple of choices.
Thanks,
sven
The problem I have with it is it sputters when going up hills under load to the point of barely moving. Shifting into a lower gear to raise the rpms seems to help somewhat. It also starts to run hot when it sputters, but it’s just when going up hills, doesn’t do it on flat or down hill even at wot with a load. The rest of the time it seems to run great, but it also had an off idle stumble which I now realize is probably an accelerator pump problem.
I never drove the truck much, just dump runs. After a couple years I had the carb rebuilt again by a different shop that successfully rebuilt several others for me, but it still had the same problem. The exhaust is very rusted from the bottom of the header pipe back and I doubt any is actually making it to the mufflers, so I was starting to suspect scavenging. I then gave up on it and it’s been parked for the last 4 or 5 years.
I’m trying to get it going again. Fuel line out of the tank is now plugged so I hooked it up to a gas can and tried to fire it up, but it was only getting gas in the drivers side venturi and none from the accelerator pump. In the last 5 years I have started rebuilding the carbs myself, in fact I’ve rebuilt 3 or 4 2300s in the last month very successfully and one 4160 a little while back, so I pulled this one apart and the primary bowl was gummed up with lots of orange “varnish”, the jets were even clogged, but the rest of the carb was clean as a whistle.
The weird thing (see picture) is the passenger side holes were sooty compared to the drivers side, so to me it’s been popping on the passenger side only. Can that be caused by the carburetor or should I do a compression test to make sure things are ok on that side? I probably will anyway, but I thought I would ask and see if anyone has ever seen that before? It seemed odd to me. I’m also posting a picture of the old gaskets in case the last guy used any wrong ones and someone recognizes that. I have the Holley kit and there are a couple of choices.
Thanks,
sven