When Did They Switch to the Internally Oiled Cam?

[Captain Obvious]

I have verified the low pressure with a mechanical gauge. Other than that, I haven't looked into the details at all.

At this point, I'm hoping that it's an oil pump. The other alternatives are much more unpleasant.

[silvey19k]

can you switch to one from the other? with a switch of the cam towers or what would need to be done?

[Jeff G 78]

It's easy to go from a spray bar to an internally oiled cam, but to go the other way, you'd need to swap towers. Personally, I wouldn't try that. Chances are high that you'd struggle to get them aligned.

[Bonzi Lon]

With an internal oiled cam you will need block off plates where the spray bar was and verify there is a plug in the back of the cam.

Bonzi Lon

[rcb280z]

My production date is 5/77 and I have an internally oiled cam. I'm almost certain that early February of 77 is when they made the switch.

[silvey19k]

yea i have a cam and towers numberd ready to go. i snaped the tower bolt and not sure and dont really want to chance messing everything up by trying to runn it. dose anybody have pics of this swap? can i just swap out one head for another its kinda a time thing im leaving the army and i need to get the z back on the road.

Edited July 17, 2012 by silvey19k

[Jeff G 78]

If you are swapping the whole head, it's pretty straight forward. I would suggest having the new head fully measured. The last thing you need is to install a warped head or one that has been shaved beyond the limits. DAMHIK.

[silvey19k]

Ok that works i'm getting the thing cleaned and a measure should not cost me to much so I think ill see if I can find a place that dose both. And then fix the other one and do a full rebuild.

[Jeff G 78]

What head are you switching to? If it's an older head, it won't be machined for injectors. You can see the notches above the intake ports. I have no idea if the notches can easily be added. I've never put a carb head on a FI engine.

[Powderkeg]

My 76 280 Z has no spray bar. The production date is 4-76

Dave Ruiz

[silvey19k]

I'm going to switch a n47 to a n47 but the one I have coming has a solid can and oil sprayer

[Jeff G 78]

Has the "new" N47 been swapped to a spray bar setup? The N47 I have is the only one I have ever seen with a factory spray bar.