I think it may be best to go over some 'old ground' where installation of these cams is concearned, so here is an extract from my reply to some qustions I have been asked about them:
The cams will come with timing marks on them, just like the factory ones - two marks on the exhaust cam, one on the inlet. In most cases, the cams are installed 'on their marks', but you will need to turn the engine over very carefully and slowly with the spark plug removed, to make sure the valves clear the piston ok, which they usually do, with no trouble. There was one case where an inlet valve touched the piston and this was fixed by retarding the inlet cam by 1 tooth, making the valve open a little later and avoiding the piston. This turned out to be due to some AVL valve seats being cut shallower than others, so the proximity of the closed valves to the piston crowns can vary a little. The decompressor mechanism also has to be removed, to allow the exhaust cam follower to drop a little further onto the new cam's base circle, this is quite easily done.
I also like to 'over adjust' the pushrods by about 4 flats of the hexagon adjuster 'nuts' for inlet and 6 flats for exhaust [both valves held slightly open] and turn the engine carefully and see that the valves and piston still clear each other, for peace of mind. They usually do, but steps can be taken as above, if required.
I will be happy to help and advise, if there are any doubts regarding fitting and setting up, but it is quite a straight forward job.
Any feedback to date relating to these cams in AVL machines has all been good and there are already quite a few out there!
B.W.
P.S. - post edited regarding pushrod 'over adjustment' for checking valve to piston clearences.