broker-len Posted June 15, 2017 Share Posted June 15, 2017 Members 21 724 posts · #1 Posted 13 hours ago · Report post I have read on this forum to put the piston at TDC and adjust intake and exhaust others say to rotate motor till one valve begins to open and set the other and when it closes the other-------------I have a 31 plymouth-------------------looking for suggestions and why------------------thank you in advance Link to comment Share on other sites More sharing options...
Guest Posted June 15, 2017 Share Posted June 15, 2017 (edited) I was thinking 6 cyl but a 4 cyl works with the rule of 9. For an 8-valve 4-cyl engine the principle is "rule of nine". If no. 1 is down, i.e valve open, adjust 8, if 2 is down adjust 7, and so on. In all circumstances there will be two valves open at any one time, turn the engine by fan belt, spanner on crankshaft nut, or jabs of the starter. For a 6-cyl engine, same principle but rule of 13. Edited June 15, 2017 by Guest (see edit history) Link to comment Share on other sites More sharing options...
broker-len Posted June 15, 2017 Author Share Posted June 15, 2017 thanks again as stated it is hard enough to adjust with the manifold on and carb off I guess I could put everything on and run motor till hot then take off carb and valve cover and try to adjust before the block cools down my owner's manual does give cold setting but also suggests to adjust hot Link to comment Share on other sites More sharing options...
JACK M Posted June 15, 2017 Share Posted June 15, 2017 Both valves should be closed at TDC. They are closed at many other parts of the cam as well, but TDC is a good indicator. Link to comment Share on other sites More sharing options...
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