What do you guys think of the speedmaster bare aluminum heads

gzig5 said

Got before and after pics of #2? I think I understand 1 & 3 but the discussions around the short turn still don't fully click.

I picked up a lightly used set of the standard ProMaxx heads from a guy that is going with the new TF and while the out of box performance of this should be much better than my J-heads, if there is some easy HP to pick up I wouldn't mind rubbing on them a little. I contacted ProMaxx and he quoted $800 to get these CNC'd and the bigger valves that he does on the Shocker 185 version. I'm only into these for $900 all up so that might not be a bad next step if/when I stroke the 340.

Click to expand...

If you read this post about the ProMax heads and look at the flow chart it touches on the subject. It’s been ages since I had that set of heads in my hands but on every Edelbrock Head and copy Head the common wall tapers in funneling the airflow at a high speed towards the valve while trying to make a sharp turn. Image going down a straight road at 100mph and speeding up to 120 going into the turn. Not gonna happen. The high speed air then jumps the valve opening and crashes into the good air going across the top of the port. A good head porter can hear this happening on a flowbench and knows the numbers are going to stall or back up. Control the speed with volume and angles and reap the benefits

https://board.moparts.org/ubbthread...l/small-block-mopar-promaxx-head-testing.html