Like a race block but not roller cam capable as advised by MP. An old member (Cory) found out when he tried to grind the valley area to fit roller tappets. The result, not good. It’s now a table.
I don't remember that. Was he grinding clearance for solid rollers or hydraulics? The Resto block used the same core boxes as the R blocks and those blocks could take a 48 degree lifter bank angle. To save weight they left the cores pretty thick (making the casting thinner) up above the lifter bores.
