[D111]

it's a vacuum secondary 770

Actual model number is 80770 -- 1

thank you sailfish for the info, my production date seems to be mid-2005 for the carburetor.I will call tomorrow to verify.do you remember when yours was manufactured?

before i came home and read these posts
I called Holley tech support the guy seemed very confident that it needed a stronger secondary spring he recommended that I purchase a 20 - 13 kit. and go one spring stronger

just a footnote when I went into the garage to check the production date of the carburetor it smelled horribly like gas for some reason my gas cap Was over flowing quite a bit onto the paint and onto the floor for some reason. I did fill it up before putting it away last weekend but it did not seem like the gas attendant overfilled it at all??