Hello Paul

If you have a drawing of a RV-4 with a turbo 13b stuffed inside the cowl,
would you please be so kind as to publish it here for me? My primary
interest is where to put the radiator - I do not believe in aircon cores -
in such a tight cowl. I would also like to have the throttle body in the
R/H (as seen from the prop end) cheek.  I have the engine, is between
projects, and lust after a -4.

Thank you and regards,

Erik Snyman
Messina
South Africa.

You will have a tough time doing that with the stock cowl.
The turbo won't fit.

Are you willing to change the cowl?

IMHO you would be better off with a P-port.