340 exhaust manifold vs stock 318

Mike69cuda said

Not trying to be argumentative, but the data from the chart doesn’t seem to show much difference between 340 / 360 manifolds and headers on a 300 hp engine.

At 4500 rpm, the difference looks to be 10-12 hp, about 3-4%. Doesn’t look like much to me.

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Yup correct 4500 and up if you need to go up there will help, if not don't bother on my v eight cars I run the 340 magnum manifolds install and go! On my slant six I have custom manifold I have made, but will soon be getting some tube headers so it will be easier to reach the moon lol.