the holley 2280 that I am using has a throttle return spring coiled around the throttle shaft. Is that considered to be sufficient or is it recommended to have a second, back up throttle return spring?

Use a second spring for safty sake.

Richard

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Part of Tyrde-Browne Racing

As Fopar said, mopar also used a regular spring as the primary, the carb's have the spring on the throttle shaft as a back up in case the regular spring fails. (similar to the setup on the late Holley 1945's).

-D.Idiot

In PA you would fail state safety inspection without two throttle return springs

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got it,, the spring on the shaft is the back up,, I should install a second one with a bit more tension on it..


thanks