Converting to carb would obviate the need for a custom tune. Trouble is, then you need to figure out how to run the trans, and most of your gauges...

Hemifever can write you a tune, but, to get it really dialed in, you would need the capability of doing some data logging, including a wideband O2 sensor.

alright so its do able? just swap all my **** to it convert it to carb than get a tune from hemi fever or bring it to a tune shop to get it to run right? should i even convert it to carb or find a way to make it efi?

If you swap to a carb you don't need a tune from hemifever, you only need a tune from him if you keep EFI.


What the heck is going on with everyone wanting to go to carb motor when it came with EFI. I just don't get it.


I posted links to 3 different engines that are Magnum blocks and will work with the stock EFI. As has already been said if you keep the EFI you will need to get a tuner so you can install the tune in your PCM.
If you switch to a carb then you will have to tune it yourself by changing your jets or take it to a shop that can tune it.

My exact thought as I was reading and I'm glad to quote you on it.

Sometimes you just gotta go do it caveman style......even today.

I completely agree with you on a separate statement you made on having to "ask how to do it".

If you convert to carb, the PCM won't have the information it needs to operate the transmission. So far as I know, there is nothing in the aftermarket to address that issue. There *might* be a solution for the RH trans..... maybe..... but, if you are going to go to all that trouble, just put a manual in it. Far easier.

That still leaves out the gauges though. Temp, Tach, and Speedo all get their clue from the data bus, which gets its info from the PCM. If the PCM doesn't know, neither will the data bus, and your gauges simply won't work. You would need to convert all those over as well.

Going to carb on a 96 or newer with an auto, is quite an exercise. If you want a bigger motor, go for the 408 magnum, get an M1, or Hughes Air Gap EFI intake for it, put your other stuff on it, and then get a custom tune. You will be on the road faster, with less effort, and highly likely to be less cost as well.

Thanks Wh13NuKle it seems we have had a few of these crab engine threads. I was the same as trying to understand a guy who wanted to take the 4.0 6cyl out of his Wrangler and put a 1981 350 with 4 barrel carb in to replace it. You're taking 6 steps back getting rid of the EFI and going with a carb.

i wanted to keep efi but someone told me i couldn't. thanks so if i buy the right intake with efi i can keep it. like i said this is my first swap, if i knew what i was doing i wouldnt ask u guys, thanks

You can keep the stock intake if you want to. Upgrading to a M1 or Air Gap just makes it run better plus look WAY better. It is ok to ask questions and we are here to help.

iagatta -- When you ask your questions, I'd suggest prior that you've done some legwork. The thought being that the legwork is the basis of your question. For instance, there are like 3 other threads in the last couple days regarding this same topic. You would have had some initial questions addressed or you could have jumped on the band wagon.

Why in the heck HeyYou like to repeat himself....is beyond me.

When you ask your questions, I suggest you take the answers with a grain of salt. Reason being is that everyone comes at them from varying perspectives (experience, technical expertise, etc.). If you have to, then it's completely fine to ask some to justify their response. Engine building books and understanding technical information of parts will take you a long way.

Also, many responses do not consider $$$. $$$ = actual greenbacks + time Again based on broad spectrum of the people participating here.

Good luck and get your flame suit on. You don't want to be one of those people that builds an engine and it runs like ch!t, followed by constant nickel/dime attempting to resolve it.