2barrel-4barrel
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Joined: Mar 2009
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2barrel-4barrel
I have a '78 f150 with a 351m/400 with a 2barrel, thinking about trying to find a 4barrel intake and carb for it.
I was wonering what your guy's opinion is on such a swap.
What can I expect in power increse?I have a fairly large camper in the box and could use a little mone umff..
Thanks in advance for any advice
I was wonering what your guy's opinion is on such a swap.
What can I expect in power increse?I have a fairly large camper in the box and could use a little mone umff..
Thanks in advance for any advice
Mountain Pass
Joined: Nov 2007
Posts: 226
Likes: 0
From: Chehalis, WA
I have a '78 f150 with a 351m/400 with a 2barrel, thinking about trying to find a 4barrel intake and carb for it.
I was wonering what your guy's opinion is on such a swap.
What can I expect in power increse?I have a fairly large camper in the box and could use a little mone umff..
Thanks in advance for any advice
I was wonering what your guy's opinion is on such a swap.
What can I expect in power increse?I have a fairly large camper in the box and could use a little mone umff..
Thanks in advance for any advice
Lead Driver
Joined: Apr 2008
Posts: 6,938
Likes: 13
I have the eddelbrock intake on mine with a 600cfm carb. Runs alot better than it did with the 2bbl. And as long as i stay out of the secondaries, it seems to get alot better mileage. I had the edeljunk laying around but if i bought a carb i would go with like a 670 holley. I wasnt aware that the valve timing on these were retarded.... is the straight up timing chain set an aftermarket thing or can you get it from the local parts shop?
Senior User
Joined: Mar 2009
Posts: 270
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I just went from a 2bbl to a 4bbl intake on my 302 and it made a good difference. It had a holley 600 on the stock 2bbl intake. Then we got a edelbrock performer rpm knock off and an edelbrock 600 and I like the change. If you have the money you might be able to get a power package from edelbrock or some of the other packages they have on jegs or summit.
Mountain Pass
Joined: Nov 2007
Posts: 226
Likes: 0
From: Chehalis, WA
I have the eddelbrock intake on mine with a 600cfm carb. Runs alot better than it did with the 2bbl. And as long as i stay out of the secondaries, it seems to get alot better mileage. I had the edeljunk laying around but if i bought a carb i would go with like a 670 holley. I wasnt aware that the valve timing on these were retarded.... is the straight up timing chain set an aftermarket thing or can you get it from the local parts shop?
Senior User
Joined: Mar 2009
Posts: 270
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The 600 is plenty of carb for the relatively stock engine. The cam is retarded 4 deg on everything in this engine family after 1971. You can get the timing set at the local parts outlet, but I would go with a good quality aftermarket roller chain and sprockets. Most of them have a couple of keyways for setting up the cam timing. Use the straight up (0 deg) keyway. Be aware that the timing cover on these engines is a flat plate with the water pump mounted to it. They get pitted and can start to leak. They are quite expensive ($125.00) to buy new so you might want to look around for a used spare in good condition, before you start the process.
Posting Guru
Joined: Nov 2008
Posts: 1,937
Likes: 2
From: wyoming
Stock engine you can gain around 30 to 40 ft lb torque. with a good timing chain straight up or slightly advanced. The holley offroad carb with annular booster is a nice little carb. Once jetted to your engine is a nice little carb for 4wd truck. Used to do this to my buddies truck and they thought I was a hero for waking up their ford trucks just by timing chain and carb tuning. Did a edelbrock performer back in the day and now their are some other intakes available. dualplane intake definetly for 4wd .
Trending Topics
Senior User
Joined: Mar 2009
Posts: 270
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So I can get a timing set, set the cam straight up, and see good gains? Just making sure I'm reading this right. Also I have the performer 600, what kind of tuning would I have to do?
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Mountain Pass
Joined: Feb 2009
Posts: 235
Likes: 1
From: Aubrey,TX north of Dallas
I'd go with a 4 barrel, in most cases you can get better milage. Example, on my 81 ltd it had the factory 2 barrel CFI injection, I put an Edelbrock 4 barrel on it, and I got way better gas milage, even with my lead foot!!! Bigger vehicles like my land barge or these old ford trucks, really do better in a lot of cases with a 4 barrel, because it doesn't need as much gas/effort to get to speed.
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