Why no DOHC topics?

[gv280z]

I've just checked every page in The Garage how to section and I'm kinda surprised that I can't find this. Why is there no How To mention of swapping in the 4 valve VG30 heads from the 300ZX? I can't be the only one to think of this, I'd be in shock if I were...I'm just interested in the performance gains from doing this and I would think it'd be a common mod for all the deep pull the engine apart guys.

 

I don't have a clue how to do it because ofcourse it involves pulling the heads and adapting the longer timing chains to fit around both cams and getting the valve timing correct, all of which is WAAY above my head, but I understand it in theory. The incoming heads and cams would have to be at TDC and the receiving engine as well I'd guess.

 

In my mind I think this would be a major horsepower upgrade. I'm interested to hear all of your response.

[Inyourface1650]

The block is different and good luck getting one to fit...

[silverton]

I heard of dyno proof that the VG30DE doesn't make any more power than a VG30E up to a certain RPM, 4000 or 4500 or something like that.

 

And it will not fit without cutting in to the frame.

[Precise1]

It is easier and better to go with VG33 heads, do a VG33 swap or build up a VG34-enstein.

 

B

[Slartibartfast]

Not a head swap, but a twin cam VG30 in a Pathy has been done: http://www.nissanpathfinders.net/forum/topic/30339-350hp-twin-turbo-1995-pathfinder-buildup/

 

 

[Kingman]

You cannot swap DOHC heads on to a SOHC block. That's why no one has done it.