Engine build August 14, 2023 08:54AM
What would be the issue to build a John Deere 414 for this class. Leaving the stroke at 5.00 and increasing the bore to 4.75 making the cid 531. I know you can take a 466 to 4.78 bore to get 531 but an 8.1 would be 540 if you go to 4.75 bore. So I believe 540 is too big. Anybody ever look into the 414 or is there a problem with building one of those for pulling.
Reply Quote

Re: Engine build August 14, 2023 09:02AM
Should have put in my post for the NTPA classic super stock class.
Reply Quote

Re: Engine build August 14, 2023 12:04PM
You do what you want, but the 414 or 6.8 is not the most rugged setup.
I don’t remember the bore spacing, but I don’t believe 4.75” is doable and have enough iron left to keep the block together. 4.19” is stock bore.
It has no cam bearings in the block, some had the first one like a Cummins.
Small main bolts, small head bolts.
Reply Quote

Re: Engine build August 14, 2023 02:58PM
I don’t think you have the correct stroke for an 8.1, I’m pretty sure it’s 5.0 too.
Agree that 414/6.8 doesn’t have enough bore spacing for 4.75.
Reply Quote

Re: Engine build August 14, 2023 11:47PM
8.1 does not have a 5 in stroke nor does a 9.0 from factory
Reply Quote

Re: Engine build August 15, 2023 12:04AM
John Deere 8.1L is 4.5625" bore and 5.06" stroke from the factory.

John Deere 9.0L is 4.66" bore and 5.35" stroke from the factory.
Reply Quote

Re: Engine build August 15, 2023 03:38AM
So how much percentage are you allowed over the 531 CID limit according to the NTPA.
Reply Quote

Re: Engine build August 15, 2023 05:47AM
None
Reply Quote

Re: Engine build August 15, 2023 10:08AM
I'm not sure it was a great idea but I spent the last 12 months building a 6.8 , we will find out soon enough if it all works.
Reply Quote

Re: Engine build August 15, 2023 02:28PM
Isn’t that just a 404. Why not start with a 466.
Reply Quote

Re: Engine build August 15, 2023 02:34PM
Never mind 404 is 6.6. So how did you get to 531 with stroke I assume. Seems most say you can’t go to 4.75 bore because cylinders are too close.
Reply Quote

Re: Engine build August 15, 2023 09:21PM
Right now it's still stock bore and cubes, it's not a ss engine, more of an enhanced farm. No there isn't room for 4.75 bore , taking advantage of the crossflow head and seeing how it does. Line bored for cam bushings,and lots more . Feel free to call me 610 five eight seven 8372. John
Reply Quote

Newer Topic Older Topic

Author:

Your Email:


Subject:
Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
Message:
Website Statistics
Global: Topics: 38,630, Posts: 229,694, Members: 3,325.
This forum: Topics: 37,067, Posts: 225,901.

Our newest member JD_8520