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You going to be close to Richard. I don't know why more motorcycles don't use hydraulic lifters like the Voyager. From what I read the GW aren't hard to check, they say at 32,000 miles, but the forums say one in a hundred might need adjusting.
Ride Safe
SD
I read somewhere that hydraulic lifters can't handle much more than about 7000 rpm. That rules out a lot of motorcycles.
On auto engines you have a lot heaver valve train, you have to have some really strong valve springs to take 7,000. The GW is red lined at 6,000. The expense of lifters might come into play, plus cam location, shims are a lot cheaper, I think most have shims.
SD