[font size="1" color="#FF0000"]LAST EDITED ON 15-Sep-01 AT 00:23 AM (EST)[/font][p]Finally got the 68' running today. However, didn't have the timing right and had a terrible back fire through the carb.(finally got it timed correctly) It's a pro re-build and I've had a hard time getting the 360 to idle, or run smoothly. I've been told that when you have a big back fire with a holley, you have a pretty big chance of blowing the power valve. I'm some what ignorant about these carbs. Could someone give me some feed back about this problem, or how hard/expensive it is to replace the power valve? I'm not sure that is the problem, but just would like some info if it is.
Thanks,
Bill. (aka....the ignorant one)

 

Here is what i have....
>>Power System:
Activated by the power valve in a Holley, this circuit supplies extra fuel to richen up the main metering system. This is a vacuum signalled valve that simply opens and closes at a preset amount of manifold vacuum. The rating is stamped on the valve: 2.5 up to 10.5 inches of mercury manifold vacuum. The lower the number, the later the valve opens, the higher the number, the earlier the valve opens. The metering for this system is provided by the two little holes underneath the power valve, called "PVCR's" or Power Valve Channel Restrictions.
Replacing the power valve with a plug:NOT RECOMENDED !!!HERE FOR INFO ONLY !!!
If I could, I'd put a electrical shock device in your mouse right now to deter you from even thinking about doing this on just about any application. Think of the power valve as a switch that richens your mixture for heavy loads and accleration. If you decide to plug that power valve, you will need to increase the size of your main jets for proper full power mixture to the point that your cruise mixture will be so rich that your engine will actually foul spark plugs. Too much gas is just as bad as not enough gas. The engine will be sluggish at low rpms, and just won't run right. If you have problems with power valves blowing out, fix the problem, or install one of the available power valve protectors. Summit sells one for about $8. All 4010 and 4011 Holleys, and many newer 4150 and 4160 series carbs come from the factory with this power valve blowout protector. <<<<<<

Drain out the fuel (front bowl) or let the engine idle to use it up. Remove the fuel line . remove the front bowl. You will need gaskets for the bowl ..etc. depending on what model you are using. use the PROPER socket/tool to remove the old powervalve ..Replace with a like device ....




__JOHN__Õ¿ö
FTE Club #7
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http://www.cruisin-north.com/
Santa Rosa, Calif.
72 F-250
ICQ#6030753
http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html

 

 

Buy an Edlebrock, simple fix, no more worries.