Whats going on here feral these heads if im not mistaken look the same as z18 and ca20 heads like you said. Thats quite abusing for prince and to think George Fury will always remain in the record books with the fastest lap at bathurt in that monstrous turboed underdog bluebird z18 with this head design making nissan look grand. If bathurst didnt change the track it probably still stand?
Feral how do these heads flow compared to non crossflow L heads??

Yes this is the Prince engine, It does look the same as the Z18 head except the dissy drive is off the end of the cam gear. Rocker gear looks the same but the ports on the G18 are sperated same as L series and the Z exhaust ports are bunched together 1,2 and then 3,4.
I have been trying to post more pics but I am having trouble getting them to upload?

Just found another engine that we are missing in this forum well I searched and no one has put it up.
Its the GA16DE which is from a jap and U.S. sentra and it can produce alot of goodies.
Could the g18 with z18 exhausts or Z18 update`s great great great grandson???
With a crank angle sensor the dizzy prob would be solved. I read somewhere one can be made up like electromotives one with coil packs and Lada bosh bits but cant remember where? ;{{
http://www.sentra.net/tech/garage/engine.php?S=5979364c9e03cb690a1ad1be190aca2d#Exhaust%20Systems

The GA-series engine has been discussed here for example:

oddball engine swaps

club article What's the best engine to put into a 1200?

Some more pics ...







G18/20 came in C30 Laurel