Reproduction of the General Motors Part #3716807 Shoulder Bolt This bolt is used to attach the upper push rod to the z-bar bushing on 55-58 Passenger cars and55-62 Corvettes. The bolt I carry is the correct length. Others have a shoulder that is too short, that allows the nut to loosen.
For more information SEE 3716807.
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Applications per the 1938-1965 Chevrolet parts catalog
55-62 CORVETTE....push rod (1/4-20 x 1 3/8-260M steel)
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts and part numbers are for replacement parts that were available at the time of parts book printing.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs,
forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!