I post these images mostly because they are ‘What if’s?”
In the early 1970’s in Pro Stock the Hemi was engine to beat. As we know NHRA weight factoring changed that landscape. Before the refactoring G & R ran Boss 429 Maverick’s.
The cars were competitive but the Boss 429 was not a world-beater in Drag Racing.
Soooo….what do you do?
Experiment that’s what. These heads look have been developed by G & R to help solve the breathing problems that the 429 had and provide more spark to the fire.
So, if Jenkin’s had not lobbied NHRA for small-wheel base vehicles it look like the 429 might have advanced a lot faster.