The engine compartments in Both Variants of 432, run VERY Hot indeed when used.
In service, we always let a MK2 (K60 Pack) run for 15 minutes at tickover to cool down. After a Major road journey. Or on Exercise.This then allowed the Heat exchanger to do it's job properly. & disperse the heat.
& then Thrown out by the Twin Fans, through the top engine louvres.
It was a long time ago now, But I cant remember about the Mk.1 Petrol. If it had a heat exchanger, or a normal radiator system. I THINK it did have an exchanger?