That's very possible Joe. Maybe even due to the lighter weight of the magnesium they wanted to keep them all the same, whether they were stock ratio exhausts and hi-lift intakes or not. I have at least 3 sets of hi-lift rockers for the intakes here, but they are also all cast (or probably forged) like the originals. So they look just like a stocker (and weigh the same), but have a slightly different ratio. So instead of having (6) steel rockers and (6) magnesium rockers, Thomas made them all the same.
