Dennis Detweiler Posted July 25, 2018 Report Share Posted July 25, 2018 On my 39 Plymouth there is currently copper tubing from the carb to the vacuum advance in an ugly "bent up" configuration. Is it ok to switch to rubber vacuum tubing? Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted July 26, 2018 Report Share Posted July 26, 2018 The original would have been the metal line and the reason for the bends and or curvature is for engine movement and twisting. The line can flex since there is a curve to the metal line. If it was rigid then it would bend and then break and then cause a vacuum leak. Also with a rubber hose the hose would be crossing over the head and also the manifold and there would be a good posibility of the hose getting hot and burning a hole inthe hose. Get the new nicad metal lines and bend a new line with the fittings. Rich Hartung desoto1939@aol.com 1 Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted July 26, 2018 Report Share Posted July 26, 2018 Use of a short rubber hose allows flexibility required to adjust the timing. 1 Quote Link to comment Share on other sites More sharing options...
Hickory Posted July 26, 2018 Report Share Posted July 26, 2018 I like how that looks don, do you have a larger pic. Did you run around the front of the head or still went over it Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted July 26, 2018 Report Share Posted July 26, 2018 2 hours ago, Hickory said: I like how that looks don, do you have a larger pic. Did you run around the front of the head or still went over it Quote Link to comment Share on other sites More sharing options...
TodFitch Posted July 26, 2018 Report Share Posted July 26, 2018 In general mild steel tubing would be better than copper as copper work hardens with vibration and may fail quicker. The setup Don shows seems like a good solution, steel tubing most of the way, especially around the hot parts of the engine, and then rubber to allow flex near the distributor. Quote Link to comment Share on other sites More sharing options...
Dennis Detweiler Posted July 26, 2018 Author Report Share Posted July 26, 2018 I like Don's idea. I'll go that way. Quote Link to comment Share on other sites More sharing options...
thebeebe5 Posted July 26, 2018 Report Share Posted July 26, 2018 Recently did mine in 3/16” NiCop brake line. Ran it around the back of the head and left some slack for timing adjustments. It will be anchored to the block in front of the temp gauge bulb with an edel clip. 1 Quote Link to comment Share on other sites More sharing options...
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