2300 carb power valve

[Anonymous]

Has anyone used the Holley two-stage power valve in their Holley. The first stage opens at 12 inches Hg and the 2nd stage opens at 5 inches Hg. The part number is 25BP-475A-12. This is the same one used on the economy 2300 carb.
If you have used this power valve, please give your input. I am going to try to tune my 2300 for economy.
Thanks,
Ken

 

[wsa111]

Ken, just leave the 8.5 power valve in your carb.

You don't need to richen the mixture too early with the 12 valve & you want full rich @ 8.5.

Just stick with the 8.5 & you will be rewarded with better fuel miliage & performance.

The 2 stage valves are for heavy motor homes. William

 

[Anonymous]

Hey William,
I have 2 Holley books, one published in '78 and the other in '87. I was reading the '78 book when I posted. Then I openned up the '87 book, what a difference in articles about the power valves. Interestingly enough, you can loose mpg's with a 2 stage power valve.
The carb I am using is a 2300 off a '69 351 a buddy gave me. I believe it is one of the economy type carbs. I haven't rebuilt it yet, just trying to get as much info about it before I do.
I think my six has become an addiction. That is until I get my stroker Ford out of the engine shop. Then, that will be the focus of my time.
Thanks,
Ken