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69 heater core- bb vs. sb

2K views 9 replies 4 participants last post by  cosmic 
A/C cars have a much bigger air box opening. The opening is about 6" X 10" or so (from memory) and would extend below a heater box. Another clue as to original A/C vs heater, would be the cowl plenum door, located on top of the pass side cowl. It's got a vacuum actuated door for controling airflow into the pass compartment. You might also look at the kick panels. If the driver side has no vent, and the pass side has a big oval hole for a vent door, with no grille, it's an A/C car.
If it's a Norwood car built after 12/68, it will have an X22 or X66 on the cowl tag to indicate big block.
 
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