Just speaking for myself- I do a lot of my engine machining on an old manual mill. I can be precise enough to cut O-ring grooves and receiver grooves, but could not be precise enough to align the head's fire-ring grooves with those in the block.
Perhaps this is a factor for other racers?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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