55 series head on a John Deere 4440 April 10, 2014 05:35AM
Hi guys, I'm new to a bunch of this and i have a 4440 that i do some farm pulls with. I have a 600cc a pump, scheid diesel .015 injectors, .093 lines, and a 3lm 466 turbo. I am now fire ringing the tractor and wondered if a 55 series head would be a good option. If it is does it bolt right up or will i have to do a few other modifications as well. Thanks for your help!
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Re: 55 series head on a John Deere 4440 April 10, 2014 11:35PM
You will need 55 series pistons as well
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Re: 55 series head on a John Deere 4440 April 11, 2014 01:23AM
You will also need a 50 or 55 series rods as well 40 series are different.
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Re: 55 series head on a John Deere 4440 April 11, 2014 02:25AM
Do a search and see what you can find.. this has been discussed a few times... It seems to depend on the who you ask...

You will have a compression decrease going to the 55 head...
You will only need the later rods, if you go to the later pistons, because the piston pin is a different size..
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Re: 55 series head on a John Deere 4440 April 11, 2014 06:45AM
We just did this over the winter if you want more info call me and I'll go over it with you. 301-992-4885
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