Thanks Jerry, this explains it ot me, and it's the 5 is the 5 degrees BTDC,

Also, I cant move my dist to make the mark line up, #1 plug lead is not to the right of the clip by the block it's to the left. I'll try and rotate all the leads clockwise one spot, to give me room to get my timing right It runs ok but prob is 7-10 degrees BTDC, This is fun, getting this closer to right, thanks for your help.

So what is the Triange mark down the line more advance. ?
-Clem


Clem Donahue; Berkeley
'51 chevy 3600 3/4 ton, rebuilt 235; 6V still, 96% stock
'65 ford ranchero