Hi folks, for the 2 1/2 and 3 1/2 litre Mark V engines there were two valve tappet numbers specified, depending on early/later engine numbers. The part numbers are C.435 earlier and C.2963/1 valve tappet.
The service manual indicates on page B.41 that these tappets have 2.25" total length. The 1946-1948 Service Manual (Autobooks, Section A, page 12) says 2.25" total length.
There are 23 spare used tappets sitting on my counter, all of them are about 2.35" long, at least some of which came out of a T-series engine.
There also are two pushrod parts numbers (C.562, C.2965) which don’t quite overlap on early/late change numbers for the tappets. Did the pushrods come in two lengths?
What are the variations in tappets, pushrods, and depth of engagement hole in the tappets? Any advice on mixing and matching?