70 dart 470 ci drag car build.

MOPARMAGA said

Now I wish I would have measured these runners to compare volume. You had mentioned to me about the way these tunnel ram runners are with a shape in the plenum then transitions into the port shape.
I've basically brought that port shape into the transition & honestly I probably hurt performance the last time when attempted this the first time because I made it small-big-small
Now there's actual taper from the top.
I think it should be much better.
Best part is I'm learning & getting a little better with a grinder.

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So if you've 'corrected' the taper issues with that manifold the HP will go up. By the time you made that manifold look like it 'needs to' to be perfect, it won't look like the original manifold and it'll have about 50% of the original cast aluminum remaining FWIW. But there's still room on the table to grow with the M1tr likely in OTB form, I think I know of one. But too as I have said in the past and has been offered here, opening to a MW intake and the respective larger intake runner will increase the peak HP of course. I'd guess it'd loose some torq as well, not that this WILL slow the car down.