05-13-2004, 07:46 AM

Randy Frazier Randy Frazier is offline

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Join Date: Nov 2000

Location: Henderson, TX USA

Posts: 96

I have a '60 Tri-power that is listed in McCarthys book as a Super Duty unit. It is cast iron and has casting #535544. I know the NASCAR SD was an aluminum 4 bbl. Can't figure out why Pontiac would produce a different casting number manifold for the 363 horse 389 if there were no physical differences in the RPO manifold 3 deuce unit. Any info appreciated.

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