Definitely added 30 horsetorques with that mod... Don't wanna high-jack your thread, but do you or anyone else have experience with Promaxx Performance heads? Have to buy two new 2.9 heads and I'm torn between them and King. Both companies have new heads with an "improved design." The Promaxx's are cheaper but I can't find much info online about them. Under the "about us" section on their site it says they started up in 2012. I know World Products used to be a common upgrade but they don't make 2.9 heads anymore. From what I've read King has a good reputation. I'm buying assembled heads, so I'm not just worried about the casting quality, but the quality of the moving stuff too. Thanks in advance y'all.
Edit: Just did some looking around and went back in your thread to see what heads you're using. I see it's Promaxx. Can you vouch for the valves, springs, and retainers as well? I'd like to not spend the $650 for Kings if I don't have to, but I will if the Promaxx's aren't worth dealing with.