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3.4.2 - Head stud replacement ( Paul Saltwick,  July 10, 2002 )

Question posted on the Saloons list:

Listers, the rebuilding of the engine on my 3.8 S-type is getting
close to being completed. The question to you all is, should I
replace the head bolts? and if so, should I go for the Racing
Quality Stud and Bolt kit on sale at XK's unlimited.

Paulís response:

The head studs can be reused, but I recommend replacing them, especially if
there is any sign of corrosion. This is more important on the later 4.2 to
avoid serious disappointment. I haven't tried the XKS studs, but if they are
made by ARP, they should be good quality. Terry's also has uprated studs.
At this point, "new" 3.8 studs are probably made in someone's basement and at
least one vendor has sold studs with cut, rather than rolled threads, so ask
where they came from. Your engine should be fitted with four longer studs
for the lifting brackets, one of which (second row, exhaust side) is a
locating dowel with a thick waist. Some of the aftermarket studs do not have
this feature, which keeps the head from moving around. If you go for high
performance fasteners, you also need to increase the torque (usually up to
70ft/lbs) to take advantage of them.


 

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