The 977 number supercedes 3887033 which fit '65 to '68 Camaro Chevy and Chevelle. The '69 396 Camaro used the 3940977 valve which was replaced by the 3969903 by June of '70. This came from the GMPartswiki website. Clint
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Originally Posted by travlnz28
Ed,
Did your part number supercede another number? I can't find your number in my GM books. I have a GM heat riser but it has another number stamped on it.
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