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I Have used Maxi/Wolseley 2200 valve springs in several A7 motors without any issues. However, I have always used them with BMC "A" series valves, collets, and valve caps; The BMC valve caps need to be machined down to accept the smaller diameter Maxi valve spring. The A series valves are available in a range of head sizes, but all (except the Metro turbo motor exhausts) have 9/32" stems, the same as the A7; the A series valves are slightly longer than A7 ones, so the seat pressure is reduced as against using them with A7 valves.
Location: N W Kent
Had my eye on some Maxi valves on ebay, but missed out on them. Will keep looking.
Location: Guildford
Location: Kenilworth
Location: N W Kent
I have just pulled one of my 1.156" inlet valves out, and it is 3.442" / 87.17 mm long with a 5/16" parallel collet groove, so certain it is a 977cc Mini inlet valve (it is marked AE3568). The cam is a fast road from Vince Leek, and has flattened tappets, so no clearance issues.
I will get some matching 1" Mini valves for the exhaust. As regards the correct collets for these valves, they no longer appear to be available. Maybe thats why the picture of the collet and cap set shown on the Pigsty website has the 3 groove collets and matching caps, although the pictures of their valves show they have the parallel collet grooves. On this basis, I assume using them with the earlier type valves should be OK?
Update - just looked more closely at their pictures. Collets and caps are matched to their race valves which do have 3 grooves.
Location: Kenilworth