Roger: Yep, there's a fan shroud, it's plastic with a 16" fan mounted to a lattice work right in the middle of a 17" hole. The shroud itself is solid, so all air is sucked right through the centre.

Ryan: It's pretty cramped down there, couldn't see much even with a torch and reading glasses, so did the braille bit and ran my fingers over the whole pump. From what I could feel there were no 'spare' holes anywhere on it.

The core is brass, measuring 21 1/2" wide x 22" high and 3" deep. We put it in when we dumped the flat-head and put the Chev motor in. Its been out twice since then, the last time would've been three or four months back when we were blaming a faulty pump for the problem, and the radiator got checked out as well.

It was after that that the idea of speeding the fan up raised its head.