Not sure if there were others, but the ones that people call the "Mickey Thompson" blocks were cast by Harvey Aluminum for a development project by PMD. Pontiac wanted to evaluate chrome-plated bores in aluminum. The bore plating wasn't successful, and somehow(?) Mickey wound up with the half dozen or so blocks. Most of them were almost direct copies of a 1960 389 block, but Tom S had one with the later bolt pattern on the rear. I have two of the others. Tom's oddball one was only one number away from one of mine (Dxxxxx).
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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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