Original gusher tubes do not fit in later heads. But that doesn't prevent building a reverse-flow-cooled engine with later heads. Pontiac's reason for the tubes was to cool the exhaust seats enough to get away without seat inserts.
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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)
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