I had a Roger King rebuild, as above, in mine way back in November 2000. It was his 140bhp spec which IIRC retained the 234 camshaft. ISTR that RK also reckoned Caterham's 135bhp was rather optimistic and that was proven as the 140bhp engine was a far better engine in all regards and the extra 20 horses made a huge difference. Roger is spot on when he says 'you would not believe the difference...'