Nicely done, your water rail looks similar to mine, like the idea of feeding it from the middle. I have a checkvalve at the rail and it takes a second or so to fill the rail and start delivering to the cylinders, worth thinking about. The rail will still empty due to the difference in pressure in the runners under vacuum, so everytime you turn the water on you`ll have a delay.
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VW Mk2 Golf 16VG60 - Mitsubishi GTO TT
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