Carb/timing procedure

I have been reading up on the Ford spark delay valves (called different by other maker) and it may help the "off idle pinging" crowd. This valve sits inline with the distributor and the ported vacuum fitting of the carb. Ported is nothing at idle, set your timing with it installed as its an open to atmosphere line. When you get off idle, the ported vacuum starts to come in and it will take 6-10 seconds for vacuum to bleed through this valve to the advance pot for a slow advance. Its free flowing the other way so when you get off the gas and close the vacuum source to the ported vacuum line, it will return to static timing immediately. Next time your in the bone yard, grab one off an early 80's carbed motor. Mine was green and the color seems to matter how slow they react to vacuum. Arrow notes direction of resistance (toward vacuum source) suck on one end to make sure its the restricted side as they were made in both directions (P for pressure on one model) for different applications.