600 Holley cfm info???

did you rebuild it?

Check the accelerator pump.

After that, disconnect the vacuum secondaries. If that works, see what spring is installed for the vacuum secondaries. It may be too small/weak. People have a tendency to put in the weak spring, which is almost always asking for problems.

After that, check the power valve.

There are no dumb questions, just people that think that they know way more than they really do.



To disconnect the secondaries, see figure 15:
http://www.holley.com/data/Products/Technical/199R7948-5.pdf

To adjust the Accelerator Pump, see:
Holley Accelerator Pump Adjustment - Stock Car Racing Magazine

http://www.automedia.com/Holley_Carburetor_Tuning/pht20000718hm/1

A few more good references that I quickly found with Google:
http://www.chevyhiperformance.com/techarticles/148_0503_carburetor_troubleshooting_tips/index.html

http://www.holley.com/0-1850C.asp

http://www.holley.com/TechService/FAQ.asp

Top 20 Carb Questions Answered - Car Craft Magazine

Carb Tuning Tips

http://classictrucks.automotive.com...ore-fuelish-thoughts/holley-power-valves.html

Carburetor Tuning the Scientific Way

http://books.google.com/books?id=oV...hl=en&sa=X&oi=book_result&resnum=15&ct=result



Ahh, I took my 1850's apart so many time om my 350 Cutlass, I could rebuild them in the dark. Really! It's not that hard once you get to know the carb.

No problem! I started working on cars well before the first electronic fuel injection system. A few years ago, I decided it was time to get rid of my carbs. The '77 Cutlass went to the great auto yard in the sky. I had over 20 carbs! :-O That's just for my Cutlass! I used to pick them up at swap meets for very little money. I had carbs for the track, for the winter, for the summer, for fuel economy (vacation trips), and so on.

Now, the only carb car I have is my '69 Firebird 350. And, that's staying with the stock carb.

Getting a spare carb or two at a swap meet, and tearing it apart is a great way to get into fixing cars. You learn a lot about organization stuff when you take things apart. You learn that you can not just torque things down as hard as you want. You learn the importance or torque sequences. And, so on. And, it's cheap, you don't need a lot of expensive tools, you can do it inside, and so on.

Also, you learn about tolerances and the how two "identical" things are not really "identical" because of real-life mechanical tolerances.

Yea, rebuild a carb - learn about life.

BTW: Check out the used books on carbs Amazon. Get a bunch, they're cheap and the info is just as relevent today as it was in the 70's.

Good Luck!