"Rev kit"

I wonder if the "rev kit" secondary purpose was to take some valve spring pressure off the spring pockets in those aluminium heads for durability's sake? I realize that this system is primarily intended to stabilize the valvetrain at sustained high rpm.







Seeing stuff like this reinforces my belief that the Y-block was truely an underestimated premium engine that was not fully developed in North America. Imagine a 4" bore, crossbolted block with higher flowing symmetrical intake ports. Here are some pics of the Argentinian Y- block "Phase II" heads. Notice the influence.....




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