What size do you recommend to install in Holley 94 3x2 set up. Vintage Speed says 2.5. I am not sure . Thanks

55Birdman  Hickory NC

ADD ON > Speedway motors said to add a PVCR power valve restrictor to each carb instead of a block for the outer 2. This they say is different lengths of stainless steel piano wire. If that is the case then I ask how and wher do you install the wire? This is all new to me. Thanks again

55Birdman  Hickory NC

What kind of cam are you running? Usually, the more aggressive the cam the lower the power valve.



Stock is around 6.5 or 7.5. If you have a mild cam, I would start with a 5.5



As far as the piano wire thing, this is a new one for me.





54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

I have stock 292. with 3x2s. carb leaks down and I was told to look at power valve replacement. Go to speedway motors and search powervalve. When holley powervalve comes up look at the tips section. There it says aboiut the piano wire. I am lost as well.

55Birdman  Hickory NC

It sounds like they are saying to restrict the path of fuel to the powervalve to reduce the amount of fuel each carb delivers, in an effort to get all three power valves to provide the fuel of only one powervalve.  How big is the hole the valve screws into?  Is there an orifice the piano wire can fit into?


Lawrenceville, GA

I havent taken the valve out yet so the hole size is unknown at this time. I am just trying to figure out what they are talking about before I do anything. At this time I cant even venture a wild a%% guess. I am still scratching my head.

55Birdman  Hickory NC

Here is what the "Tip Sheet" says from Speedway:  IT IS COMMON TO PUT IN LOWER NUMBERED VALVES IN MULTIPLE CARB APPLICATIONS. IF YOU USE A STANDARD VALVE USED IN SINGLE CARBS THE ENGINE WILL BE RICH. IF YOU ARE CRUISING AT 55MPH AND STEP ON THE GAS TO PASS , THE VACUUM DROPS AND ALL 3 VALVES COULD OPEN CAUSING THE ENGINE TO GET 3 TIMES THE GAS IT NEEDS. AT WIDE OPEN THROTTLE (WOT)THE ENGINE CAN COPE WITH THE FUEL. IF YOU USE A LOWER NUMBERED VALVE BELOW 45 IT DEFEATS THE PURPOSE OF A POWER ENRICHMENT SYSTEM. IF THE VALVES DONT OPEN TILL WOT THE BENIFIT OF APPLYING A BIT OF FUEL WHEN THE THROTTLE IS OPENED IS LOST. A BETTER WAY IS TO PLUG THE OUTER CARBS AND USE A STANDARD VALVE IN THE MIDDLE ONE. THE BEST WAY IS TO PUT A RESTRICTOR (PVCR) OR POWER VALVE CHANNEL RESTRICTOR WHICH LIMITS THE AMOUNT OF FUELTHAT IS ADDED -- NOT WHEN ADDED. THAT SIMPLY IS DIFFERENT LENGTHS OF STAINLESS STEEL PIANO WIRE.

NOW YOU KNOW WHAT IT SAYS. SOMEONE ENLIGHTEN ME THANKS

55Birdman  Hickory NC

Guys, It's what Charlie is trying to tell you. The number on the power valve is the inches of vacuum that the valve will open. In other words WHEN! The wire that they want you to install will restrict the AMOUNT of fuel each of the THREE power valves will allow to pass. You would have three times as much as you need (at $ 4.00 a gallon). Also. it's actually a bad idea to do that since the extra will foul plugs and wash the oil from you cylinder walls, turn to carbon, etc. So find the outlet passage from the power valve chamber and insert a piece of piano wire into it. Do this in a manner so the wire can't blow out into the engine. use the original numbered power valves. You may have to play with the power valve numbers to get a seamless transition. Too late an opening (low number) will get a flat spot, or throttle setting where the engine won't make power, Too early will loose some power, throw black smoke nad be hard on fuel mileage. See, nothin' tuit!

Frank/Rebop

Bristol, In ( by Elkhart) 

So, pegleg would it be better to install plugs in the outer 2 and maybe a 5.5 in the middle and see what happens?

55Birdman  Hickory NC

Put plugs in the outer two, cut gaskets to block the idle circuits in the outer two. You'll have less to go wrong. Mine's running great, I was a second and a half quicker in '07 than '06 on a 239. My goal this year is to break into the 17 seconds.

  Dennis in Lititz PA