The official 6bt conversion thread

Engine, ignition, fuel, cooling, exhaust

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xxxtina63
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re: The official 4bt conversion thread

Post by xxxtina63 »

Oh, almost forgot. It's mandatory for all restaurants to switch to low linolenic oils to comply with the new trans fat regulations. Don't know if they are really more healthy for you, but they require much less heating than what's been around in the past. And while it's still thicker than water at room temp, it doesn't thicken into a block when it gets cold. Should require a lot less heating to be useable. However, I don't know if the new soybean based oil is better or worse for mileage.
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Post by averagef250 »

Good info!
1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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re: The official 4bt conversion thread

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:yt:
1968 F100 Took the running 390 out, and installed a Built 300 with AOD.
Engine Video... http://youtube.com/watch?v=2xgYd2u79NU


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re: The official 4bt conversion thread

Post by mljjones67 »

Dustin how much will you charge me for a set of motor mounts for the 4bt. What does a rebuild cost on the 4bt? Also out of all the transmissions we have discussed which one do you think is the best. So to hook it up it only requires one wire from the starter solenoid to the starter? Is that correct. What about the sensors. DO I need to get then fro a ford dealer if I go with the Chebby one I found?? Thanks for all the info!!
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re: The official 4bt conversion thread

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The last two for now.
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1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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re: The official 4bt conversion thread

Post by j41385 »

So why does the 6bt not have the fuel timing advance for cold starts, and have the heated intake grid instead?
1968 F100 Took the running 390 out, and installed a Built 300 with AOD.
Engine Video... http://youtube.com/watch?v=2xgYd2u79NU


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Post by averagef250 »

I don't really know. My best guess is that because the 4BT was a retrofit motor in many cases cummins didn't want to complicate the installations with the intake grid. Just a guess, I really don't know, just can't say I've ever seen a 4BT with the heated grid and every 6BT I see has them.
1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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re: The official 4bt conversion thread

Post by xxxtina63 »

That '94 is going to be pretty sweet when done :thup: . Kind of makes me wish I'd picked up a '92 4x4 a local guy had for sale for $800 with a clapped out 4.9/5spd.
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Post by averagef250 »

The '94 is pretty nice. It actually started life as a super clean '94 F-150 2wd. I put the body on an '87 F-250 4x4 frame and added the 4" springs and BFG's. The guy really liked his truck, just wanted the exact same thing, but big and burly, now he's pretty much there. I'd say he'll have around $10K into it all said and done including what he bought the truck for. That's about what you'd pay for a decent powerstroke of the same vintage. He likes the idea of the cummins. He spends a lot of time in BFE northern Alaska and wants the rock solid reliable simplicity of the 4BT. After the motor's done he wants a 60 up front.
1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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re: The official 4bt conversion thread

Post by mljjones67 »

What ford motor mounts will work? Or which ones should I look for on ebay? Also what do I need to modify on them when they come? Thanks so much for letting me pick your brain.
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Post by averagef250 »

The brackets that attach to the engine are used in 80's and 90's 4BT ford installs. The rubber mounts themselves are 80 something to '91 dodge 5.9 cummins mounts. This stuff all bolts on and needs zero modification and bolts in with zero mods to the truck into any 1980 and newer ford chassis that was available with the 300 six.

What must be modified is the frame stands on 1979 and older ford trucks to match the newer style motor mounts. The 4x4 frame stands must be cut down about 2.5"s and the angle is different. The ones I have made you cannot tell they are not factory. Also, if your truck is a V8 truck you must move the frame stands up to the 300 six set of frame holes and drill 4 new holes, two in each side, to bolt them in. Drilling the holes is very easy.
1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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Post by 460 crew »

What happens with front crossmember clearance? I know the 6bt you have to hack it up and drop it a bit. Does this engine sit behind or above to clear, or is it just shorter?
1970 4x4 Crewcab build and 12v cummins conversion
http://www.fordification.com/forum/view ... 22&t=17179
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re: The official 4bt conversion thread

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You don't need to touch the crossmember with the 4BT. When installing a 6BT into a '79 or earlier ford 4x4 you have to drop the entire engine and tranny down atleast an inch to clear the radiator and firewall by an RCH. The transmission also gets moved back a couple inches to put the back of the 6BT right against the firewall. The 24V is even worse, actually will not fit without firewall cutting because of the way the rear of the head is cast and how the one piece valve cover has to come straight up to come off. The 4BT bolts in and sits like it came there. Well, it does sit back in the frame a bit more than it would seam it should, but sure makes getting in the engine bay to work on anything nice.
1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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Post by 460 crew »

Right on! I have a buddy that keeps trying to talk me into just dropping a 6bt in there and I might regret it if I don't due to lack of power. I figure I'd have the best of 2 worlds with the 4bt nice power and fuel mi along with simplicity. Sure would be nice to have all that room after fighting the 460 all the time.

My dads 24v usually pulls a consistant 17mpg on average, that just doesn't seem that appealing. If the little brother of the 6bt does what your saying why would I even concider a more expensive more time consuming conversion?
1970 4x4 Crewcab build and 12v cummins conversion
http://www.fordification.com/forum/view ... 22&t=17179
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Post by averagef250 »

The big cummins will pull more and burn the tires off better. The little one will pass more gas stations.
1970 F-250 4x4 original Willock swivel frame chassis '93 5.9 Cummins/Getrag/NP205/HP60/D70
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