Heres a bit of automotive history. I used to have a 5 port aquaplane head.
http://cgi.ebay.co.uk/Aquaplane-Aluminium-Oil-Cooler_W0QQitemZ200288370757QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item200288370757&_trksid=p3286.c0.m14&_trkparms=72%3A1301%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318