The Pontiac V8's used in '55-'59 GMC trucks all used basic cast iron manifolds. They may have been identical to Pontiac pieces, but I'm not sure. They don't look any different than Pontiac, at least from the top- perhaps the outlets were slightly re-arranged.
Apparently you were looking at aftermarket headers that someone added to the truck. Were they 3-tube headers? Center exhaust ports of '55-'58 Pontiac engines were siamesed.
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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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