old original spread bore manifold what carb? 69 power wagon
#3186384
10/25/23 12:02 PM
10/25/23 12:02 PM
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Joined: Jul 2006
Posts: 164 Pahrump NV.
Doright
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I have an old 69 Power wagon 4x4 short box with a small block 318 and 2 Barrel carb. Recently I picked up a 71 parts truck for some needed odds and ends for its restoration, with it came a date code correct set of heads and a spread bore intake. I have always wanted a 4 barrel on the truck although its not really correct for my rig it was a just want type of thing even though it will burn more fuel. But hey I needed the heads any way. and I am gonna swap the heads after a valve job and the intake will be off any way so why not do the swap if I can find the correct carburetor and air cleaner for it. The short block has been rebuilt with a Steel crank Forged full floating pistons and a Mild RV hyd. cam.
So I am curious as to what is the correct carburetor should be for a small block spread bore manifold?
Not after big HP so as much as good power and Torque and the Stock appearance of original equipment as this is a classic 4x4 used for light trail riding and is not a daily driver, after I repaint the Truck it will serve as a Tow rig for my Plymouth Sat. to car shows.
Thanks in advance for any and all comments and any help.
Last edited by Doright; 10/25/23 12:05 PM.
D Barnett A&P mechanic, FCC general radio Telephone operator.
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Re: old original spread bore manifold what carb? 69 power wagon
[Re: poorboy]
#3186588
10/26/23 09:10 AM
10/26/23 09:10 AM
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Joined: Jul 2006
Posts: 164 Pahrump NV.
Doright
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I figured it would be a Thermoquad But I wasn't sure about size or specific model without an electric choke? model number?
I want to avoid a Edlebrock knock off for it, I have a few old Carters laying on the shelf and a Bunch of the Edlrocks I have collected over the years. I have never been happy with the Edlebrocks I have taken many off of cars over the years that should have had a Quadra jet and have always removed them.
I like the Quadrajets but I wouldn't put one on this truck it wouldn't be correct for a 69 pick up.
The engine in my Truck is the original 69 318 for the truck with the manual 4speed I rebuilt it years ago with good parts, I will probably use one of the Carters/Edlebrocks I have laying on the shelf after a quick rebuild, Just not sure if I have one without the electric choke, the Truck uses a Heat stove type choke.
D Barnett A&P mechanic, FCC general radio Telephone operator.
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Re: old original spread bore manifold what carb? 69 power wagon
[Re: poorboy]
#3186589
10/26/23 09:19 AM
10/26/23 09:19 AM
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Joined: Jul 2006
Posts: 164 Pahrump NV.
Doright
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I also would not be4 too concerned about the guys that would complain about the 4bbl conversion, they will already have their nuts wound up tight because you have installed the )D 4 speed. What ever their opinion is doesn't really matter, they are not the owners of your truck.
I am in agreement, Its my Truck which is why I want the 4 Barrel lol I will keep all the original 2 Barrel stuff If and when I decide to sell it will be included with the sale. I have plans to fully restore and paint the truck, I have had it almost 30 years myself its a good rig but I don't have any plans to sell any time soon. I did not install the 4 speed? it came from the factory with it.
D Barnett A&P mechanic, FCC general radio Telephone operator.
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Re: old original spread bore manifold what carb? 69 power wagon
[Re: Doright]
#3186721
10/26/23 09:37 PM
10/26/23 09:37 PM
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Joined: Jan 2003
Posts: 10,634 Freeport IL USA
poorboy
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If you have a spread bore carb with an electric choke, it will work fine. If you are running headers, that electric choke might work better, the old stove pipe set up didn't work as well if the heat crossover in the intake didn't function correctly. Just make sure there is a cover over where the stove pipe would have bolted on. By the time the spread bore carbs came around, I believe the stove location was already closed, but with the earlier 4 bbl intakes, they had an open hole into the exhaust crossover which needed to be closed. 20 years ago I could have told you which intakes had what, but that water has will left the area. If that intake has an EGR valve, make sure it and the gasket under it doesn't leak, the EGR does not have to function, but the hole in the intake has to be sealed..
The 340 and the 360 4bbl intakes do have larger intake port then a 318 has. For street use, the differences in the intake port size won't be noticeable, and the intakes seal just fine. Do not worry about the intake port sizes unless you are going drag racing. That 4bbl and opening up the exhaust from the restrictive single exhaust (just adding dual exhaust with the stock 318 exhaust manifolds) will make a noticeable difference in the seat of the pants. I ran a 340/360 intake on 318 heads with a huge cam on the streets without issue for 5 years. When we put that motor in our dirt track car, the 346/360 heads made a difference that was not noticed on the streets. Higher RPM makes the difference, if you plan on turning that 318 much past 4800 RPM, consider the 340/360 ( or late magnum) heads.
The spread bore intake first showed up on a 340 in late 71. It had the Thermoquad, and the open casting stove pipe choke. By 73, the 340/360 intakes had the closed stove pipe choke with an electric assist (that pulled the choke open pretty fast in cold climates). As far as I remember the Thermoquad never had a full on electric choke. When the Quadrajet replaced the Thermoquad in around 1983 the Quadrajet had the full on electric choke, but the intake also got the EGR valve.
Last edited by poorboy; 10/26/23 09:45 PM.
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Re: old original spread bore manifold what carb? 69 power wagon
[Re: volaredon]
#3188023
11/01/23 11:49 AM
11/01/23 11:49 AM
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Joined: Jul 2006
Posts: 164 Pahrump NV.
Doright
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Thanks guys
I still need to dig through all my carbs and see if I have a spread bore? I want to say all the ones I have are square but its a big pile of carbs I have been collecting for years, I just have to get my fat ass on the Top shelf and start digging through them to see what I have up their.
D Barnett A&P mechanic, FCC general radio Telephone operator.
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