scottw

I currently have a 750 double pumper on my 350. Whenever I hit the gas at a standstill it bogs down or sometimes stalls. I am looking at getting a holley 600 or 650. What are the pros and cons to both?

Vetterodder

If your engine is otherwise stock or only mildly modded, a smaller carb would be a better choice. I suspect that your problem has more to do with the mechanical secondaries than it's size though. Having total control over secondary openning is one of the advantages of a double-pumper but it can also be a disadvantage if you try to drive like you would with a vacuum secondary carb. Sometimes you will get a bog even with a perfectly matched carb (vacuum or mechanical) if it isn't set up right Seems to me that the 625 cfm Road Demon would be a good match for you but most anything with vacuum secondaries should help compensate for your heavy foot.

Barry's70LT1

Hi Scott..

I have a 750 Holley DP. It takes quite a bit if tuning to get it matched to
a particular configuration.
If you can post the details of your configuration, engine(stock/non stock items), tranny, rear gears, then I'm sure there are lots of 750 owners
that can offer assistance.

I also have a 600 Holley vacuum, if you were interested in a trade.

Barry

scottw

The engine has a 350 cam in it. The tranny is a TMH400 auto and the rear gear is a 3.36.
I don't have a heavy foot (most of the time), I can press the gas pretty lightly and it bogs down a little. If I do hit the gas it really bogs down for almost a full second.

clem zahrobsky

holley recommends a DP for light cars with deep gears,manual trans and engines built for top end HP

SILVRTOY

Clem...I'm running a Holley 750 on my ZZ4 and have the same problem. Would a 650 be my better choice or have the 750 rejet to a 650. Thanks for the help

tworottiedogs

Want to trade?? Brand new Holley 600, electric choke and shiney finish? I was planning on something bigger than a 750 but if you want to trade it is definitly a step in the right direction.

Smokehouse69

Mike,
That 600 is way too small for your BB. If you two guys can make a trade I think you'd both be better off.

clem zahrobsky

a 750 vacuum secondary should work fine on your engine. post the list number from the front of the choke housing of your carb and i will see what you have.

SILVRTOY

tworottiedogs...Let me give it some thought. If its a go I could meet you at ST Corvettes. My carb has less then 2000 miles of use

SILVRTOY

Clem...thanks I will but it may be the weekend before I can get some numbers to you

tworottiedogs

Sounds great. I pass ST everyday on my way to the base.