It's pretty simple. First, you get an 11 stud head to copy and drill the
head. Note that the stud is actually a necked down bolt that has a 5/16"
NC thread rather than the 3/8" NC thread of the stud. The head is then
used to locate the new hole in the block, which is normally drilled down
into the water pump opening on Cooper S blocks. If you're drilling a non-S
block then you could choose not to drill through and thus eliminate a
potential water leakage issue. The bolt is torqued to 25 ft-lbs only, and
not over-torqued, as the block is not very strong in that area. If you
don't have a handy Cooper S head to copy, just get a 1275 head gasket -
they all have the 11th stud hole punched in them. I've done this mod once,
but never bothered after that, as I never seemed to have head gasket issues
in that area that I needed to solve as long as I was using uprated studs
for all the regular studs.
brian
At 12:14 PM 7/17/01 -0400, David Littlefield wrote:
>A friend wants to put an 11th head stud in his BMC A Series (I think 1098
>or 1275). I believe this was done on the Mini Cooper S engines. Anyone
>know where I can find information on how to do this so he can give it to
>the machine shop? Vizard apparently doesn't address it in his book.
>
>Thanks.
>
>David Littlefield
>'62 MGA MkII
>'51 MGTD
>'74 MG Midget vintage racer
>'88 Jaguar XJ-S
>
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