[Y-Blockhead]

Originally Posted by Jack Shaft

Model A or model B engine timing..one degree of advance per thousand rpm is what you are shooting for.
diameter of pulley x3.1416 divided by 360 gives you degree spacing.On a model A stock crankshaft pulley 5 degrees is a bit over 1/4 "..or use your nurex timing grid and TDC mark.hook up timing light and cheapie garage sale tach and dwell meter (40 bucks on Amazon) start engine, at 500 degrees either move the breaker plate or turn the distributor cam (pain,you have to shut off the engine and fiddle with it) to be 5 degrees advanced at 500 rpm,10 degrees at 1000,15 degrees at 1500 and so on check up to 2000 rpm.Basically as rpm goes up you can see the mechanical advance rise,basically 'mapping' the advance,this tell you if your advance is working correctly.the b works well,what get confusing is static timing it,so dont,use a timing light.

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