Quote:
Originally Posted by zzmac
The powervalve was not replaced during the carb rebuild.
They are recommending replacing the Holley 770 with a Holley 650 double pumper (0-4777C or0-4777S or a 0-4777SAE).
Now to find one that won't break the bank.  |
That just costs you additional money for someone that doesn't know how to tune a craburetor. Don't do it, you don't need to.
What vacuum does the power valve you currently use open at and what vacuum does your engine idle at?
Ed
p.s. Holley power valve numbers will look like 125-XX where the XX postscript in the part number indicates the vacuum opening point. There can also be additional postscripts following the XX that might include the letters "QFT". the QFT component of the part number stands for Quick Fuel Technology. A simple power valve part number of 125-65 would be a powervalve that opens at 6.5 inches of vacuum.
You will also find single stage, dual stage, high flow and six digit part numbers. A part number of 240025 would be a power valve for a Demon with a 2.5 inch vacuum opening point.
Click here for a listing of currently available Holley power valves =>
Holley Powervalves Holley offers a total of 63 different choices for you.