Picked up a Holley Trick Kit for parts to rebuild the Holley 2300 / 350 CFM carb that I had purchased (actually from Joshie 225). The power valve that came with the carb is identified as opening at 8.5 inches of vacuum. The rebuild kit has the following power valves, 8.4,,8.6,, 5.?, last digit poorly stamped probably a 0,,, Among the three power valves that came with the kit, the only physical diference I can see is the one that is a 5.? has the spool staked midway on the threaded shaft, the other two the spool is threaded about flush to a few threads shy to the end of the shaft.
for use on a mild street 225, A833, D-150, os valves, dutra duals, aussie 2bbl manifold, are there recommendation on which power valve to use ?

thanks

What cam? your idle vacuum is a number that is essential.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

This may be helpful, look herefor what Holley recommends.

Video: here then click on: Carburetor Tuning; Play List; and Holley Carburetor Power Valve.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

thanks that is helpful,

I have vacuum reading from the bone stock motor, 19 to 20 at idle,
still working out the cam selection, I'll plug one in one of the 8's, If adjustments are needed later,, at least I have been there before.