I recently picked up an Old Porta-Air V8-100 Air Compressor. Its a monoblock that is based on a Ford 302 V8. It is similar to the older smith and grimmer Schmidt compressors. There was no labeling on it so it took forever to figure out what it is. Anyway, what it looks like is that Porta-Air bought the rights to the Hesse/General Supply compressor design and used it for the V8. Porta-Air got bought out by Iowa Mold Tooling Co. They make tire service truck compressors. I called and you can still get valve parts for the compressors (compressor is discontinued), and the parts look identical to the old Hesse/General Supply parts.
If you want to confirm I can measure the valves I pulled out of my compress to verify and dimension you need.
Here is a link to the PDF manual http://www.imt.com/common/pdf/manuals/D ... CMPRSR.pdf
Below is screen shot of the compressor parts page:
Hesse Hornet / General Supply Compressor Parts
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