I know that inter-generational cam swaps such as swapping back to a pre-AVCS cam have been done. I'm curious about putting exhaust cams onto the intake side on DOHC heads from the ej25. Is there a fundamental incompatibility? I know that the sprockets are an issue. Is the difference in lift and increased duration not worth the work? I would walk down to the shop and look but it's 11 miles away. If my memory serves the two cams have the same journals and the only differences are in the gear end and lobes but I might be confusing the L-R intake cams. I did try to search before posting.