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exhaust manifold studs

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Hi Gents

Can you help please.

I am about to drill out a broken exhaust manifold stud ( lucky only one broken ).

What is the depth of the threaded hole in the head? 

What is the total length of the stud?

I am worried about going too deep in to the head.



   Chris Ward

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May I add a word of caution - I bought a v8 as a project and found someone had decided to rebuild the engine before me and had drilled out the studs and gone into the oil galleries. Unfortunately the head was not recoverable and another had to be sourced. The specialist rebuilding the engine stated the oil galleries are very close to the stud holes and if drilled out incorrectly can be breached and often as not knacker the head - as happened with mine.


I have been lead to believe good cylinder heads for the v8 are rare as rocking horse poo so care may need to be taken.


Good luck



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