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Hey everyone as the title said im stumped. I recently swapped my quadrajet for a holley and also swapped my points for an hei distributor. I thought i had it pretty well dialed in until i put the car in drive to take it around the block. When I put the car in drive and hold the brake I it idles really rough and im out of ideas. If it helps here is a photo.Attachment 32145
Is it a square bore Holley??? What did you use for an adapter to the Q-jet manifold...Could be a big old vacuum leak....
Also what size and model holley did you swap it with?
its a 650cfm sitting on a edlebrock performer intake I didn't need an adapter the intake had two mounting locations for the rochester or holley and what is a square bore?
square bore is all four holes the same size.... Anyway, sounds like things are matched up correctly, did you check for vacuum leaks at the base of the carb and around the intake gaskets? What do you have the timing and idle speed set at??? Have you adjusted the mixture screws???
I personally believe that you need a spacer to mate the square bore Holley to the spread bore manifold, but don't take my word for it. Call the Holley tech line and explain your problem and I believe they'll be able to solve it.
I have it timed to ear I've got the mixture screws backed out 1 1/2 turns, how would i go about checking for vacuum leaks at the base I do have a vacuum gauge.
I use a spray bottle of degreaser sprayed around the base of the carb and along the intake manifold gasket. If the RPM increases, you found your leak!
Another thing, I would suggest borrowing or buying a good timing light, much more accurate then by ear.....
thanks for the tips do you happen to know what the vac pressure should be at the manifold
If the engine is stock, probably around 17" or so, less if you are running a performance cam...
hay croom if you go to home depot buy a cheap propane torch unscrew the tip and put a 3 ft peice of vacuum hose and clamp turn on the propane use the end of the hosse to find your leak the rpm will go up when you find the leak works great no mess ted
Hey Ted Dehaan
Where you at in Whittier?
I'm at Mills and Broadway...
MM64 :cool:
I'm in mesa
oh yeah thats in the profile
alma school and main