block advice

[Temden]

I am in need of some advice. 

I am in the process of refurbishing an old block and whilst I managed to remove most of the old head studs one snapped despite heating it. Common I know.

I have managed to drill out the old stud but in the process I fear I may have been over enthusiastic and drilled too far and gone into the block. It is the middle stud on the Valve side, as shown in the following picture. 

Please could anyone tell me if this might be terminal and the block scrap before I carry on? 

Thanks

Tom

[Charles P]

As long as you haven't drilled through to the valve chest (look where the valve springs sit) you'll be ok with loctite around the stud.

[Temden]

Thanks Charles. I will check.

[stuartu]

If you proceed with the block I’m sure you will check that the little waterway next to the stud is clear. If it isn’t it can give rise to some interesting symptoms.

Regards,

Stuart

[Ian Williams]

I sectioned a block to look at the waterway Stuart mentions and around the centre exhaust valves. it was an education and helps understand just how clogged and restrictive this area gets. I now regularly drill through these and other stud holes and use a small but long rotary file to improve matters. Just seal the studs as Charles mentions, which is good advice on all the block studs that go through into water ways.

[Temden]

Thanks Stuart and Ian. The advice is much appreciated. I will make sure the waterway is clear and then seal the stud.