470 Overheat

[aussie]

my advice would be remove thermostat and try it see if it over heats

A easy way to check for a head gasket leak or cracked head

(1) you need 4 long screwdrivers
(2) connect hose to engine and run it till its hot
(3) remove all 4 spark plugs
(4) place a screw driver down each spark plug hole
(5) wait a minute remove a screw driver one at a time and check for moisture of the screw driver
(6) if you find one with moisture that's the cylinder that's leaking

I have been using this method since I have been in the trade it works