cheers lads, the engine was completely rebuilt, new pistons, existing block, rods, crank, but a new head as this melted aswell along with the piston when the actuator pipe popped off.

it was stone cold, the engine sounds as tight as a nuns chuff when it fired, just like the the smallest amount puffed out, like a fart size lol. It was warmed up for a while then driven.

the head was new to the engine, but unsure it was 'brand new' like it never been run.