YES. ITS ALIVE

was tappets afterall. new (well, 2nd hand) set in there now and all's good

aparently it idles a bit lumpy at 800rpm now, but i think thats to be expected with a cam change. its also given me an excuse to raise the warm idle to 1000rpm as its easier to map at 1000 than it is 850 (no interpolation)

i'm SOOO relieved its nothing major, as i was expecting to be buying new valves