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I have came across a dilemma. My 2001 xjr is in need of head work. No shops around me are willing to rework my current heads. But I do have a couple of xj8s available. Will the 2000 or 2001 xj8 heads fit and work with my xjr?
Will the 2000 or 2001 xj8 heads fit and work with my xjr?
Yes, NA heads will be fine on an SC (xjr) engine provided you plug the VVT oil holes. This is like the work shown in TSB 303-31 but you will do the opposite - install a rivet in each head.
For this, you will need to get special plug-rivets, 8 mm. I also had to by a bigger rivet gun as a standard one could not be used. The pull-rod of these rivets has 3.5 mm diameter.
Avdel Avseal II 02961-00810 High Pressure Series Blind Sealing Plug; M8 Diameter, Aluminium Sleeve: