[Jac Mac]

Not sure whats been going on in this case, but with the Ford production 'dog-bone' you must check to ensure that it sits flat on the machined pad around the top of the lifter bores when the lifter is at full lift, ie the lifter should not raise the dog bone off that pad at any point in the lift cycle, if fitting them to an early non-roller block the lifter bore pads must be milled/machined flat & square to the lifter bore along with useing a reduced base circle cam to allow it to operate as intended.Easier, but more expensive to buy a set of link bar hydraulic roller followers for use in early blocks especially when you consider the extra cost of longer pushrods, & the special cam grind...