Hotrod Magazine Slant Six Build Up

BillGrissom said
My biggest question is that it appears they used hydraulic lifters in their 1972 engine, based on the photo of valve timing components (unless some solid lifters had a side hole). Is that the real reason they had to buy shorter push-rods? Unlikely they would make that mistake.
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Those are not hydraulic lifters. They use the hydraulic lifter body and pushrod seat, but the seat (if I recall correctly) sits on a "ledge", and cannot move. In effect a solid lifter. Just another issue of the "bean counters", trying to save money.