Because they are push rod oiled - Mega block with bushed lifter bores, crower roller lifters and trend pushrods - I have seen other builds with both spray bars and pushrod oiling - but that seems to me like way too much oil going up top - my rockers are 1.6 ratio

I looked at all of the rocker systems available - and for the small upcharge to Barton - it made sense - if the new T&D system for the Eddie Victors was available when the engine was built - I would have gone with those