the setup is for a427 chevy bb and seems that level plug on side is lover than 4-barrel.maby a way to get better idle and not flooding. here is all metric threads and all inch threads gone to s**** so is there anyone that knows what size treads it is in fuel boel on a holley
Is fuel coming out of the sight plug hole? Those are extra-fine threads, forget about restoring them. You can get those clear plastic pugs, they have a co**** thread with an 'o' ring seal and screw them into the hole and the 'o' ring will fix a leak. That won't do any good for flooding and bad idle. That might well be the needle & seat sticking, with the air cleaner off it do you see fuel flooding out the top of the vent tube? If so, the needle & seat are sticking and you'll have to replace for reliablity. There is quite a few other things it could be, hard to give good advice without more info.