Andrew,
the How to modify your Nissan/DAtsun engine book says that you cant run
bigger valves because of contact problems at TDC. Also says the ports
are relatively small and the ports are angled low complared to L series
which does not help airflow.
Craig.
andrew smith wrote:
>
> I'm thinking about fitting a Z series head to a L20b turbo motor. I know
> I have to fit a Z20 timing cover and I'll probably fit a Z20 head and
> dizzy as these seem to be easier to find and cheaper. I'll make my own
> manifolds. Can anyone tell me of any differences between Z18,Z20 and Z24
> heds in regards to valve,port and combustion chamber size. Is there any
> problems when using heavily ground cams in these heads. Thanks in
> advance.
> Andrew Smith
>
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