only running 32ex 38in all kameari gear after speed,i tried to get valves made in the US they weren't interested it wasn't a chev/ford. like to know how he fitted 42 in they must be hitting what hp was he getting

Those kiwis are pretty resourceful especially when you
compare how little population & $$ they have vs Australia.
Im pretty sure they were ca20e or z20 valves both 42mm stock
as the bottom of my ca20 valves had the same nissan insignia
and measured 42mm in diameter as do some Z inlet valves.

http://datsun1200.com/modules/myalbum/photo.php?lid=20264



42mm in could be the ticket as you dont need anything but
standard valves for exhausts for turbo.
Yet A14force could have benefitted with 40mm inlets and
34mm ex as supercharging needs a bit more ex flow.

These are the CB vw heads that can make 180+ HP for 1.7L engines
https://www.cbperformance.com/product-p/1409.htm
You will notice how nicely shaped the chambers are to suit
the massive bores avail to VW engines while the Kiwi head
above is like a squashed up version but pays attention to
make sure that big 42mm valve stay more central in the
cylinder chamber to keep the charge away from the cylinder
walls with no notching on top of deck required which is
what you want to maximise a deep compact tornado effect
centered in the cylinder away from walls a very clever design.

It looks good d I read the article he had to cut the valves down a lot so you have to run caps to which I had to on my last head, if you run a heavy valve spring it tens to start flaring the stem because you cut the hardness off. this time I brought the biggest a/series racing valves I could get so I didn't have those problems that I had before. it a shame someone didn't make a billet head for our motors

Funnily enough the chamber on the A series is reversed compared to the VW
The inlet charge comes in from the spark plug side of the heads for the VW
while the A series is towards the sparkplug which creates nasty turbulence.
I always wondered what a pre-chamber would do to the combustion chamber of
a speedway head that had been shaved for ethanol in order to bring the
compression down and not have the spark plug protuding into the chamber.
https://www.ebay.com/itm/Spark-Plug-No ... orman-42009-/311811788035

https://drivetribe.imgix.net/cEu0Npy5T ... press&fit=crop&crop=faces

http://i66.photobucket.com/albums/h25 ... 20EL%20Heads/IMG_2184.jpg