<VV> Power valve carb ID

[NicolCS at aol.com]

There's a 1/8" diameter plug in the side of the carburetor bowl.  It's at the 
lower edge of the bowl, right behind and slightly below the end of the 
accelerator pump lever.  
Craig Nicol

<snip>If I'm digging through a bin full of Corvair H (primary) carbs. How do I
tell which ones have power valves? Most of them don't have tags. I've always
taken them apart in the past, in order to find out, so I don't know how to
tell from an external-only inspection.

Thanks
Andy Clark
<usnsip>