4BT VS a carbed 318 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 18 (permalink) Old 12-08-2010, 06:13 PM Thread Starter
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4BT VS a carbed 318

I am just kicking this idea around here so do not pass judgment too quickly. I have a 1972 Dodge D200 with a 318 and 727 that I am pretty much stuck with. (It has been in the family since it was new.) Do not get me wrong, I do love that old truck. But an all original 3/4 ton
gasser does wear on my patience quite a bit. I would love for the truck to appear original outwardly, but have more modern and reliable stuff underneath. I can repair a diesel engine a lot better than I can this old gasser. So the way I see it, this old and reliable stock 2BBL 318 most likely puts out the same if not less power than a stock Cummins 4BT. So I figured with a few mild mods and a good overdrive transmission a 4BT would do this old truck nicely and get me down the road with fewer 30 something year old issues to correct every week. Feel free to chime in. What would the pro’s and con’s be on swapping out that old low mileage 318 for a 4BT?

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post #2 of 18 (permalink) Old 12-08-2010, 06:15 PM Thread Starter
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By the way, I already have an early 90’s Dodge donor truck with a Cummins 6BT in it. The 6BT is slated for another project. But everything else from the truck can be used to support a 4BT swap into the old D200.
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post #3 of 18 (permalink) Old 12-08-2010, 07:56 PM
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Pros; fuel economy, torque, reliablilty, useability, coolness factor

Cons; Cost

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post #4 of 18 (permalink) Old 12-08-2010, 08:29 PM Thread Starter
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The cost is what scares me.

How about this for an added touch? Paint the engine and all the accessories the same stock color the orginal 318 came with?
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post #5 of 18 (permalink) Old 12-08-2010, 08:32 PM
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That would add a nice touch. Depending on how high the Cummins sits, it may even look factory.

-Robert.

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post #6 of 18 (permalink) Old 12-08-2010, 08:41 PM Thread Starter
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I can keep the install clean enough to maybe pull that off. Okay, this idea is gaining some steam with me now.
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post #7 of 18 (permalink) Old 12-08-2010, 08:46 PM
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Do it!



-Robert.

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1997 GMC Suburban SLT 5.7L 4A

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post #8 of 18 (permalink) Old 12-08-2010, 08:52 PM Thread Starter
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How about this? Will a 4BT handle highway RPM's?
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post #9 of 18 (permalink) Old 12-08-2010, 08:54 PM
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Yes sir. Remember, those engines are used in all different kinds of delivery trucks. Next time you see a Frito-Lays or UPS truck, more then likely thats whats under the hood.

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post #10 of 18 (permalink) Old 12-08-2010, 08:59 PM Thread Starter
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I do want to pull trailer with this truck down the highway at highwat speeds. That 318 has done a great job for the past few decades. But I have some trouble with a four cylinder staying at a relatively low RPM at highway speeds. I know gearing has a lot to do with it but I still have some worries.
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