They're still out there - right place and right time - NOS HP4S

[Scott_Conger]

Never a trace of fuel in this thing...mint float valve and valve actuation assembly and not a hint of wear anywhere - even the throttle plate sports casting flash and the bore has no seating marks from the throttle plate. The fuel and vacuum fitting have never had a connection made. Generally speaking, for use on a Frontenac or other similar "T" use, the vacuum intake seen on top would have been used with a vacuum fuel reservoir.

The throttle arm was broken at one point and brazed back together with modest skill but is unfortunately, still obvious. Perhaps done when new and no one wanted to buy it off the parts shelf? Who knows. Hard to believe I was able to find one in this condition much less find one at all. To quote the late Stan Howe, it is made of "Unobtanium" and I think to call it rare is almost a misappropriation of the word. The best part was that the price was right, with shipping being a significant part of the purchase...

This is one of, if not the premier carb for the go-fast overhead guys and I thought someone would enjoy seeing it. Also was used as standard equipment on 1920 Crow-Elkhart 6 cylinder cars as seen here in June '20 Motor Record Magazine Vol7 No.6 Page 3: https://books.google.com/books?id=E74AA ... rt&f=false

If you've never seen one, take a look at the interesting ball-shaped throttle linkage...I don't believe anyone else ever used such a contraption. For now, it will remain an example of how they came from the factory, as it just seems far too nice to restore such a remarkable patina.

[John kuehn]

Is the flare fitting original to the carb? It looks like a more modern fitting. It’s a screw in type next to throttle lever.

[John kuehn]

Is the flare fitting original to the carb? It looks like a more modern fitting. It’s a screw in type next to the throttle lever.

[Scott_Conger]

It looks new, but it isn't. It is a 37 degree flare for a vacuum line.

[Scott_Conger]

It looks new, but it isn't. It is a 37 degree flare for a vacuum line.

[Duey_C]

Fascinating carb. Goll, that mount flange is perfect. Thank you for showing this!
No number or letter stamps on the flange surface yet.
I hope you don't mind this:
The HP4S shares a whole bunch of parts with the O (O4) long throttle lever updraft meant for the 4 cylinder cars.
Zenith claimed "F-O-O-L P-R-O-O-F" in that neat ad. No doubt as the O (04) float needle, once set in factory, is actually soldered to the collar that hold the float levers inner end. Wow, neat carb.

[Scott_Conger]

Duey

look at the ad again and scan down just one page and see the child operating a multi-blade knife switch to start a motor. You wonder why so many adults do such stupid things today? The answer is that we because no longer winnow them out when they're young.