:stupid: You may want to think about it, before you change the system. I have had both systems on Z's that I have owned and liked the spray bar oiler side better. Most of the book on our motors will tell you to keep it. Most of the problems with the cam oil system is that it may have problems put into it by the people who made it. I like doing both together and not worrying about losing the top end to no oil. The spray bar oil system is good, so much so that they recommend it for the L-16 to L-28 racing engines. The cam oil system used mostly in the L-28 engine with the new heads. They have been known to wipe out cam lobes and lifters from no oiling. It seems the cam makers didn't drill the holes into the cam in the right location and ended up not getting the oil in the right place. It has happened to me in a 280Z. So now I add a spray bar if it doesn't have one on it. You make your choice and go with it. Good Luck, Rich.

David,

Is there an internally oiled camshaft for the 240 that is "ITS" approved? If so, let me know which year so I can get one.

As far as an opinion on internal, external, or both, I have run all three and each one works as long as every thing is clean. My personal preference is to not run both because the cylinder head has only one single small drainback in the rear of the head and putting that much extra oil in the head will probably force oil to drain back down the timing chain robbing power. I don't have any proof that this will occur, but if you take a look at other cylinder heads through today's current production units, there is significantly more drainback capacity on smaller heads.

Bret

72 ITS 240

73 240

Hi Bret,

I walked into local nissan dealership, and ordered a 240z cam....it came internally oiled.

Was told the 240z part #s replaced with later ones.

Not a lot of difference, but I know for sure I have a cam thats not worn.

David