Help with port map options , needing help with picking port timing changes to move rpm range up and make has much power as possible. . I've got a 1985 merc XR2 2.0 I've learned it doesn't have finger ported pistons or block.. so far I've got chest work cut , and rod slots cleaned up. Going to D port pistons also. Click image for larger version.  Name: 1228171626b.jpg  Views: 53  Size: 275.9 KB  ID: 395728