hi it's allan has any body got any answers to camaro heating under hard acceleration & up hills only thanks

heats uphill & under hard acceleration all water related parts brand new,bigger radiator,water pump,oilcooler outside,seneors,thermostst,cylinder head & gaskets air-con & heater pipes disconneted .best anti freese , heads tested for leaks all good.free flow exhaust no cat converter.spent lots of money to excellent machanics problem still there.can somebody please help