Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 12:24AM
I am potentially building a Case 970 pull tractor.

I want to take the 401 cylinder heads out and replace them with Case 504 cylinder heads, which 504 engine would be best to pull the cylinder heads out of?
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Re: Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 02:24AM
The valves in a 504 head won't clear the cylinders in a 401. If you're altering them to get clearance, the 504 heads with Bosch screw in injectors, not the pencil injectors are the way to go. The 2090/2290 heads have 45* angle seats which are better than 2390 on up heads that have 30* seats is what's been mentioned in other posts.
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Re: Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 04:00AM
Can you bore out pencil injector bore in 401 heads to accept screw in injectors from the 504?
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Re: Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 06:13AM
It depends how close the water jackets get to the injector bore on the 401 heads, I don't have any experience in that area.
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Re: Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 07:08AM
Thank you for letting me know that the 2090/2290 would be better than the 2390.
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Re: Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 06:16AM
what state u in and what class u lookin run ?
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Re: Case 504 Cylinder Heads in a Case 970 401 October 05, 2018 07:05AM
I'm from Ontario.


Looking to run in 8000lb modified farm under the OTTPA.

I should have specified that I wanted to modify the cylinders to fit 504 heads and that I knew I wanted bosch screw in injectors. I didnt know which model of case engine would be better.
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Re: Case 504 Cylinder Heads in a Case 970 401 October 06, 2018 01:22PM
the heads from a 504 will never work on a 401. it has been tried on a 451 with the sleeves notched for valve clearance . win the air comes out of the valve chamber it runs directly into the cylinder wall thus losing its swirl pattern. lots of smoke and no horsepower. on a 401 don't think you could notch the sleeve enough to even make it fit. 2 different people that I know have tried it on the 451 to no avail. the one person went to indy cylinder head and had heads made. most rules wont allow that.
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Re: Case 504 Cylinder Heads in a Case 970 401 October 11, 2018 05:56AM
Thank you for responding,

I have talked to a few people that run 970's in the class I will be pulling in. They have done this and say that it works.
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Re: Case 504 Cylinder Heads in a Case 970 401 October 12, 2018 11:40AM
There is a builder in the South that puts JD injectors in the 504 heads and moves the valves for a 466 class.

He builds new pistons. Claims he can get over a 1000 hp at 3000 rpms
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