The MP Engine Book mentions installing distribution dams in many single planes. As an example, for the M1 single plane intake it is recommended to install two dams, in front of the #4 and #5 runners, 3/8” high. It is stated “when used with stock cylinder heads” as well as “engine is able to make 5-7 horsepower more” Regardless of how much hp would/wouldn’t be realized, how does this modification apply to better aftermarket (or even ported oem) cylinder heads? In general, does the mod still apply for better flowing heads? Would there be any noticeable gains or improvements, and is it still worthwhile to do for a “strip/street” application? I’m of the mindset of “I’ll never notice the difference and is best left to the competitive racer” or possibly needed after doing plugs readings otherwise no need? Thoughts from those who have experience with these recommendations (for any single plane) or in general when using heads other than factory welcome :)
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