timing help
 

: On the z6 crankshaft pulley the red mark is 16' BTDC, there are 2 other avd and retard marks on either side of the red. What degrees of timing do these marks represent?
(my old school timing light doesn't have the option to change what timing it blinks at; and im retarding my timing for N2O. If nothing else I'll measure the distance from TDC to the red 16' BTDC and divide by 16 to get the ~ mm of crankshaft to 1 degree ign timing. not ideal but it should work)