when u look at the main caps the billet steel look black and are smooth all over, the ductile iron caps are the same color of the block and u can see that they are castings , they are somewhat rough on the sides.
when u look at the main caps the billet steel look black and are smooth all over, the ductile iron caps are the same color of the block and u can see that they are castings , they are somewhat rough on the sides.