GM Sticks with Pushrods

[69Mach1]

The suggestion that OHC is modern technology is laughable...check the history books.
OHV vs OHC - positive and negatives for both. On V and flat configurations OHC can present packaging issues. Inline engines not a major problem. When it comes to variable cam timing & multi valves OHC has the advantage, its a bit harder to control exhaust and inlet timing independantly with a single cam.
Its great GM is sticking with push-rods, another easy-fit option for resto-modding something old.