Overheating Smallport 4age AE71- Headgasket?

[pauliee]

hey there guys,

Car - AE71

motor / part in question - Smallport 4age

problem - Overheating

I made a thread about a month ago, but it was for a somewhat different issue.

The issue is im currently having is my smallport will gradually overheat. I can drive it hard, no issues, but on longer trips, (20-30) kilometres, it'll rise gradually. I read somewhere someone had issues with it getting hotter at high speeds, and plateauing at low speeds. I havent driven mine for a little while (off the road with broken tailshaft), but it does sort of rise steadily, and drop as it pleases.

Im using a 35mm alloy radiator, as well as new genuine Toyota water pump and all new gaskets, new ae86 radiator piping, as well as tested Thermostat, and proper coolant.

I got the motor locally, and the previous owner had done a full gasket replacement etc etc before putting it in his car. But following parting the car out, it sat as a spare for approx 2 years.

So im in two minds at the moment, on one hand, im thinking about getting another radiator,

()

one of those ^, because for not much less cost the 35mm radiator can be serviced. But im quietly concerned that it may not be the radiator, and there may be another issue with the motor.

I thought about changing the water temp as well, but a mechanic i spoke to briefly mentioned that they normally wont read at all if at all there stuffed.

any advice would be appreciated.