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The GAC Truck

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Finally got the carb swapped. This reman Holley is the way to go. It looks brand new including all the hardware and it's Set up perfectly out of the box. I only had to tweak the idle down a tad. Definitely plug and play. It's almost too nice to put on this pig lol.

I also decided to add a fuel pressure regulator at the same time. Since the old Holley kept pushing fuel out of the vent tubes and I had similar flooding problems with the old qjet too. It got me wondering if my stock fuel pump was putting out too much pressure. Regardless if it was or not I have it regulated to 6psi and the new carb is very happy.

IMG_20181207_170703.jpg IMG_20181207_170845.jpg
 
So today I swapped on some new mufflers I had kicking around. Thrush Turbos. Sounds a little throatier but overall not much louder which is good. It definitely breaths easier though and now the throttle is quite a bit snappier. I believe one of the old mufflers was partially blocked from an old mouse nest or something. Also something weird, the driver's side is 2.5" and the passenger side is 2.25" go figure... And yes you're damn right I kept the chain exhaust hangers!

IMG_20181220_181023.jpg
 
So the last two times I plowed with it, it started right up but after a few minutes started running rough no mater where I set the manual choke. I popped the hood today to check the carb and I noticed frost on the base plate of the carb. It wasn't there when I first started the truck. I'm wondering if the intake and carb are literally too cold and that's why it runs rough and idles real low until it's fully warmed up? Any thoughts on how to fix this as I can't just let the truck idle and walk away, I have to feather the throttle every 30 seconds to a minute to prevent it from stalling.

The truck does have the exhaust flapper valve on the passenger side exhaust manifold that is supposed to restrict flow and force it through the intake crossover but it's not functional. How can I make it so?
 
Got an open air filter? A regular airbox will help, plus you will need it if you decide to make the exhaust doohickey work.
 
beags86 said:
Got an open air filter? A regular airbox will help, plus you will need it if you decide to make the exhaust doohickey work.
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Yup open element air filter. What do I need to make the flapper valve work, and is it worth it to track all those parts down that 90% of people have thrown in the trash many years ago?

Maybe I can rig it up on a manual cable to just pull it open/closed.
 
I don't remember what's all there, a vacuum operated valve? Or is it a coil spring that opens once it gets hot?
Seems like a junkyard would be your best bet. See if you can find the whole dang unit?
Or maybe just buy a nitrous bottle banket and wrap the carb in? Only 50% joking about that...
 
beags86 said:
I don't remember what's all there, a vacuum operated valve? Or is it a coil spring that opens once it gets hot?
Seems like a junkyard would be your best bet. See if you can find the whole dang unit?
Or maybe just buy a nitrous bottle banket and wrap the carb in? Only 50% joking about that...
Click to expand...
I did some googling, the one on my truck is just operated by a bi-metalic spring. It's super easy to swing mine around so I'm not sure it's functional. So now I'm wondering if it's easier to rig up a cable to operate it or risk breaking the manifold studs while replacing the valve... :thinking:
 
Chevy305 said:
I did some googling, the one on my truck is just operated by a bi-metalic spring. It's super easy to swing mine around so I'm not sure it's functional. So now I'm wondering if it's easier to rig up a cable to operate it or risk breaking the manifold studs while replacing the valve... :thinking:
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Just buy a choke cable and get to work
 
beags86 said:
Probably help but that won't warm up the carb. If that's what he's going for. But to your point I'll never install another block heater again.
After finding these.

https://www.fleetfarm.com/detail/ka...0i3hSaYnOLWV82FJWPIxMrxIMu6lElkUaArRoEALw_wcB
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Yeah those ones with the pump are sweet. We run them on some stationary engines here at the plant and they work so good. Plus easy install and the cab seems to get a little radiant heat when there's coolant flowing through the heater core.
 
Truckman4life said:
Yeah those ones with the pump are sweet. We run them on some stationary engines here at the plant and they work so good. Plus easy install and the cab seems to get a little radiant heat when there's coolant flowing through the heater core.
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That's the main reason I love them. Jump in your truck and the heat works.
The only thing better then that is a heated garage and heated seats.
 
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78K30 said:
I didnt realize those had a pump, I just assumed they relied on thermosiphon action like a lot of other heaters.
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My daughters Dodge has one one it. When we got the truck it was installed with zip ties and barely hanging on. I spent a bunch of time making it fit real nice, I plugged it in and it seemed like it was going to be Tits! Then I noticed a leak near the thermostat housing? I unplugged it and plugged in the original block heater, leak went away and the block heater is working fine. So I haven't pissed with it again. Not sure what the problem with it is?
 
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