I have been getting mixed reviews about these two. I see that IM heads are a little cheaper than getting the heads worked by someone. What are the PROS and CONS on these. Will one be more efficient than the other. I have searched but havent gotten a clear answer on these. Thanks in advance.

CRAP!!!!! thanks

All i did was heads and exhaust. Stock carb and my boat is a f'n barge. 19'3" x 50" of heavy shit. i haven't gps'd it yet but with all my camp shit and my two kids, I turn 4150 all day going back and forth. I really need to gps it to get some speeds but i know that with my heavy ass boat loaded, and my podna's boat loaded bout the same way, I'll pull away going to the camp from him. His is stock, but with a much lighter boat.

from all the threads your going to SEARCH and read, you will find that the IM heads are cookie cutters. As in all done the same. Cody from SETX asked me my intentions and what other mods I was plan on doing, and cut the heads to accomidate. And I'll do it again if I had another without a hitch.