kilgorq

What are the symptoms of a bad power valve in a Holley 6150.

The motor will not run well until about 2000 RPM. It bounces between 400 and 900 RPM. It acts almost like it has a really big cam in it but it is stock for an 85.

I checked for vacuum leaks and found none.

Also fuel bowls are leaking out the side where the metal plug is pressed in. Is there a fix for this besides replacing the fuel bowls?

67mustang302

A bad power valve if it's stuck open will cause terrible idling, excessive fuel consumption and the car will just plain run like crap at light part throttle but will run fine at WOT. If it somehow sticks closed(unlikely) then it will idle and drive fine at part throttle, but when you crack the throttle open it'll get lean and run like crap.

kilgorq

Sounds about like what I am seeing. If I punch it, it will stall a little then rev right up and run great. It will not idle.

I think it is time for a rebuild with the power valve mod or a new carb.

Does anybody have and tips or tricks when doing the rebuild?

This is a stock 85 5.0 with Zero miles on it. The exhausts is stock except for the mufflers which are glasspacks.

67mustang302

Just put a new power valve in it, they're changable

kilgorq

Please refresh my memory it has been about a decade since I messed with a Holley carb.

What about the fuel bowl leaks? It there an easy fix for those or do I need fuel bowls.

HACKGT350

is it the stock carb? if it is get a new one that thing is garbage and has a recall on it a dangerous one

Yonco

just go buy an edelbrock 1405! thats the best damn 230$ ive ever spent on my car, my holley 4b gave me nutthin but probs and the edelbrock bolted on in 20 mins and runs great( btw, my sig pic is theholley, i have the edel 1405 on now) -Jon

my77stang

yonco if you dont want that new holley 600 i'd be happy to take it off your hands