340 to 416 stroker build need advice

Go with forged pistons if you plan to rev it past 5,000 rpm. The longer stroke increases piston speed and forged are needed in a performance application.

I went with a Flowkooler water pump and Mr Gasket high flow 160 thermostat with three 1/8" holes drilled in it to prevent air pockets. Stock three row radiator recored. So far runs nice and cool.