(another) CARB question: 650 Holley
 

When throttling to plane out both motors bog (seems to me as if floods for a moment) out at about 2200 rpms and then jump and take off and run fine through the rest of the rpms ranges.
I was told the power valves need to be replaced....
Does this sound accurate? Do they need to be replaced or is there a way I can "tune" them?
Thanks

motors: small block 383's holley 650 carbs

Re: (another) CARB question: 650 Holley
 

It could be accelerator pumps are not working properly. They are on the bottom of the bowls. Press down on the lever and look down the carb for fuel squirting out. This should happen whenever the throttle is advanced. Is the carb stock?

Re: (another) CARB question: 650 Holley
 

Carbs not stock carbs, it appears as if plenty of fuel sprays out when lever pressed as well.....

Re: (another) CARB question: 650 Holley
 

Replace The Power Valves Is A Good Idea.

Re: (another) CARB question: 650 Holley
 

There is also a plastic cam eccentric that moves the accelerator lever. They have different contours for a more precise acceleration and if not set-up correctly could possibly cause your problem. Just another option, good luck.

Re: (another) CARB question: 650 Holley
 

The power valves, if it has them and they still work,, may not be the proper opening values. Also do the carburetors have manual or vacuum secondaries?

Re: (another) CARB question: 650 Holley
 

good info. heading to boat this afternoon... no vaccum secondary....
does have power valves, gonna do some tinkering this afternoon..
will let you know what i come up with thanks for all the input