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Hello I will help you with your question,
The intake cam has the nub the cam sensor reads, it is on the transmission end of the cam.
Let me know how I can help, (pictures of that end of the cams would help)
Can you see where the nub is that the sensor reads? That is the intake cam.
The thrust area should be in a different position on each cam as well so they only go in one position.
Can you post a picture of the cams side by side?
Sorry the numbers are not part numbers nor do they identify the cams. Can you post a picture of the cams side by side?
They are manufacturing numbers not part numbers so there is no way to identify them from those numbers.
Can you post a picture of them side by side?
I am not sure where you sent pictures? You can use the paperclip icon on the toolbar to attach them to your post.
I found another post that has the R90400056 as the intake cam and the engine was running so I assume it is correct.
Please let me know if you have further questions