Double Nut Method to Tighten Head Studs

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Protect the stud with chamois leather or whatever, Tony - any scratches will weaken the stud…

Frank
xj6 85 Sov Europe (UK/NZ)
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the book was out, and digicam to hand, I think the photo is readable with some magnification

Hammills advice on the issue

Yes, oversized studs (block end) are sometimes a good solution. Corvair studs, which are similar to those on long-stud XK engines, are available (+0.003, +0.006) from vendors. Do Jaguar vendors also sell oversized studs?