Thread: when did GM put catalytic converters on Sierra 305s?
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Old 01-06-2011, 05:15 PM   #6
Keith Seymore
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Re: when did GM put catalytic converters on Sierra 305s?
Quote:
Originally Posted by lakeroadster View Post
I believe 1975 was the first year that they were required on 1/2 ton trucks.
I can confirm our '75 1/2 ton shortbox had a cat converter.

(It blew up and tossed it's contents all over the freeway).

K
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