Black, 153 =O O= 145, Black
Black, 150 =O O= 40, No visible wear or carbon/Oily plug
Black, 150 =O O= 145, Black
Black, 150 =O O= 30, No visible wear or carbon/Oily plug
D= Distributor
Ok, that's my engine lay out. # is the compression number and the color detail is...