My opinion is- that the entry end must be correctly shaped (funnel-shaped) to cause the majority of coolant to enter the tube, rather than "spill" around it.
Unless the tube material has significant corrosion, I've always been able to re-shape it well enough.
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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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