Quote:
Originally posted by David_Hayward
Not noticed it before but Holden, Woodville built the cabs so was it something to do with the fabrication process? Rectangular would also allow in more air (and dust).
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Because GMH already had the tooling to make the rectangular vent . They had been using it since 1939 on their civilian Chev . cabs . Why spend lots of money making new press tools for the oblong shaped vent , when there already existed a useable rectangular press tool .
Mike