I hope someone can enlighten me...
I have a Holley 4150 600CFM carb (1971 vintage) the needle & seat assemblys will not come out of the fuel bowls. It's almost as if they were pressed into the bowls. Also, the needles & seats that came with the rebuild kit are nothing like the ones installed currently in the fuel bowls. The current setup has the adjusting nut, but the lock screw is one solid machined piece of brass. It has a straight slot cut in the top but does not "overhang" the outter diameter of the nut. I have tried pulling the seat out and wrenched on it a bit, I think I may be damaging the fuel bowl at this point :( , it's almost like there is (was) a shoulder in the upper part of the fuel bowl for the top of the seat to ride against. Has anybody ever seen one of these set ups? How do you change the needle & seat assembly? or am I just wasting my time trying to get it out?
Thanks to everybody that makes this a great website, it is an awsome resource!
Scott

Try unscrewing it. The Holley pieces have a nut and screw. The one you describe is a cheap replacement part.

Thanks for the reply Dennis, I forgot to mention that I did try unscrewing the seat assembly (counter-clockwise) from the fuel bowl. It starts to back out but then it gets extreamly tight> I'm afraid that I am stripping whatever threads it may have left. Any other ideas???
Scott

It's probably snagging on the O ring. Spray with WD-40, grab it with pliers and pull it out.

Well, I got the needle & seat out. But the damage was already done. :mad: It looks like I'm gonna' be purchasing a new fuel bowl. Live and learn...
Thanks again for the help...
Scott