Water leak on a 4.2 V8 (1996)

[mattclubb]

Last night I was driving about and then steam started pouring out of the left hand side of the bonnet.
After a bit of troubleshooting I've discovered that water was escaping past a bolt in the main block.
The bolt appears to be a blanking bolt that has sheared. It is located in the main block right next to one of spark plugs.
I think the thread is an M12 x 1.25mm pitch. Can anyone tell me the purpose of this bolt and whether anything is going to drop into the engine when I try and replace it with another blank?
I noticed that the one next to it had been previously repaired but no idea when.

Thanks a lot in advance

P.S. its just over a week since I got the bugger so I'm gutted at the mo!

[Extra 300 Driver]

From a dealer?

[mattclubb]

Sadly no...

[Extra 300 Driver]

Best thing to do mate is call Joospeed, or TVR Power.

[mattclubb]

Well I've got it booked into Castle at the end of the week, just need to get it there! Service @ Castle reckoned I simply plug it up with another bolt but he didn't sound too sure, don't want anything dropping in the engine!
Would the AA be the best bet?

[Extra 300 Driver]

Just ask them to fax over their instructions, i.e get it in writting.