Does anyone know where to purchase 1mm oversized valves for this head?

 

 

Sent from my iPhone using Classic Zcar Club mobile

1 mm oversize valves would not be a standard part.  You'd need bigger valve seats also.  Are you sure you can't just replace the valve seats and use standard size valves?

Don't know what you're trying to do but your request is odd.

Hi Zed, yes the plan is to have the seat cut to fit the oversized valve.


Sent from my iPhone using Classic Zcar Club mobile

I'm going to guess that you'd need to have some made.  The N42 has the biggest valves already, for that head design.  The ZX heads have the same valve head sizes too.

I'm pretty sure the Z valves are shorter in length than the ZXs. Seems like Diseazed uses early Z valves on his cut P79 head.My machinists used Dodge Hemi vale seats on my E31 when I went to the bigger valves. My expirences/memory only.

https://www.rhdjapan.com/search/engine/nissan_fairlady-z_s30-l28-09-1975-07-1978/model/nissan_fairlady-z/car/nissan/brands/kameari/category/cylinder-head-and-valvetrain_valves

I'm sure you can also contact an L-series engine specialist to get what you need...