Right then, Friday morning, (the day I should riding to Norfolk!). First thing was a good tidy up. I'm not very good at keeping my work area tidy while I'm working. I don't have very much room so the workbench and hoist were covered in tools, oil, paper towel, rags, bits of BSA etc. etc. A clean bench helps to focus the mind, doesn't it.
Musky, the springs were all about 1.873". I took 60 thou from each one, so now they are around 1.813".
duTch, the pushrods, (from SRM) have the length printed on them. Have a look below
edboy, here is a photo of the two old camshafts that I have. As you can see the reconditioned camshaft and the followers are pretty well buggered! The other one may well be the original item.
The stems protrude 9/32", (just over 1/4").
The collet design is deffo not correct for these valves. They work OK, as you can see in the fifth picture but may well be too low on the stem, which may be a problem now with this slightly higher lift cam. I found an image of some NOS collets for sale on Ebay. They are much shorter!
The Inlet valve that I have the springs off can open 1/4" before the collet touches the valve guide.
While I've been writing this I've had the idea of, while the head is on the bench and the springs are removed of checking valve protrusion inside the combustion chamber when depressed and seeing if it's possible for the valves with only 1/4" of travel to touch the pistons, which do not come to the top of the bore at TDC. More later.
