Interesting, sounds like Hervey used the same port adapter fitting for both hoses.
Most systems typically use a smaller diameter discharge HP hose. Typical system is D -8 (1/2?). S -10 (5/8?) which is consistent with the slightly different port diameters.
Any possibility increase the port diameter or have the QC head drilled and tapped to accommodate the brass relief valve. You can see the spot where it go in casting.
This issue didn?t come up with my installation, as I didn?t use the Hervey hoses.
Btw, Ethan mentioned needing to drill the head port slightly larger in has last post here.
What about trying the GV head. ( horizontal ports like the original with HPR) looks like it has two large ports.
https://coldhose.com/products/sanden...ompressor-head
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