what else???

Stealth Pilot

As VeeDubber has pointed out the heads are the limiting factor for HP.
The VW has other problems but workarounds for them have been found,
even if they are inelegant ones.

I've looked at and sawed up more VW heads, and sketched out more ways
to improve them, than a sane person would be willing to admit to in
public. If one insists on dual plugs and a true improvement (other
than just more cooling capacity) then I haven't been able to come up
with a solution - unless one also moves the camshaft and spaces the
lobes out to match the bore spacing. This requires a new crankcase as
well.

Doing this opens up MANY options using inexpensive off the shelf
parts. I'm thinking a split head, like Scat makes, but following the
layout of a Porsche 356 might be a good starting point?

Oil-cooled VW heads are an option I have not heard anyone talk about
for aircraft use. I've not done any math related to this option but
it seems to be a viable one. Anyone actually tried the methods used
by Porsche tuners on a VW?
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Leon McAtee