Dakota Durango Forum banner
1 - 6 of 6 Posts

·
Registered
Joined
·
1,013 Posts
Discussion Starter · #1 ·
I know there are a lot of differences between the two 4.7's but as far as the block itself is there any difference? What would keep people from putting 08+ heads onto an older 4.7? I know the internals and heads are the different but is the block itself any different? If so what is the difference?
 

·
Registered
Joined
·
1,013 Posts
Discussion Starter · #4 · (Edited)
it still only has 8 coils. its just like the srt engines...one coil does both plugs in the same cylinder.
That is what I was thinking, it is only one coil with a plug running to the second one and both plugs are in the top end of the motor. If they do fit but the coils wouldn't work couldn't you just run the old coils and run only one plug (with the other just filling the hole). From what I have read, it seems to me that the second plug is more for emissions then performance.

Also, other then the bump in compression, intake manifold, and lighter internals, it seems like a big difference between them is in the heads and I've seen entire long blocks selling for cheaper then ported old 4.7 heads. I'm thinking that if the heads could be swapped it could be a nice gain in performance.

Even if the heads won't fit I wonder if you could run the motor off the older computer? With them being so new I don't see it being very easy to get heads without getting the entire motor and more then likely if I ever tear that far into my motor the entire thing will come out for pistons and rods (and I have a spare block sitting in my barn).
The bottom end doesn't look all that different.
New:


Old:

 

·
Registered
Joined
·
1,013 Posts
Discussion Starter · #5 ·
After a bit of shopping around, I found out that fel-pro's head gasket (part number 26157PT) for the 4.7 is the same part number for 2000-2008 dakota 4.7's.

This is looking promising, if the headgaskets are the same I don't see why the new heads wouldn't fit... but getting them to fit and making it run are two different things.
 

·
Registered
Joined
·
1,013 Posts
Discussion Starter · #18 ·
Swapping out tone rings wouldn't be a problem as I have some spare ones from a 01.

I am curious if an 08 motor could be run off of a 01 computer, switching from an 01 computer to an 03+ computer would probably require rewiring everything like josh did on his hemi swap since the 03+ have four plugs and the other have three. I really don't see why it wouldn't work, it is the same basic motor, I'm sure some connectors would need to be changed and a different tune but I don't see why it wouldn't work.

I am not surprised that the pistons have recesses in them with the upped compression ratio and different head design, it could still be possible that they will fit on a stock older motor. For me personally I would more then likely be changing pistons if I ever tried putting 08 heads on a older motor anyway.
 

·
Registered
Joined
·
1,013 Posts
Discussion Starter · #24 ·
josh had to do alot of extra wiring because the ( i think) bus system was different between the 01 and older and the 02 and older (possibly 03)

but i dont think you would need to rewire anything....maybe just change some pinouts. you would just delete your tcm and put your 4th plug in with the 03+ pcm........i think...im a bit tired right now...just got done pulling the engine and tranny
I have a 5 speed so I don't think I even have a TCM... I think the problem is that the 3 plugs from a 01 computer might not plug into the spaces in an 03+ computer. I think the connectors are different.

Would there be any reason I couldn't just keep my 01 computer and get it retuned?
 

·
Registered
Joined
·
1,013 Posts
Discussion Starter · #37 ·
ahh...that makes it easier...and you should be be able to do it with the 01, just the tone ring swap isnt very fun...the cam one is easy, the crank one you have to pull have the bottom apart...including the girdle.


but i think i still have some 4.7 pcm plugs here....you would just have to put your wires in it.....if interested, just let me know.
you have to pull the girdle? I'm guessing the bedplate on the bottom end? I pulled the tone ring off of my spare short block without doing that but it does look like it would be a pain on a complete motor.
 
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top