I doubt the 256 would give up much it's got slightly more @ fifty duration, less advertised, similar lift, on a 110 lsa which should give better low end torque than 340's lsa.
But yes we don't have any dyno evidence down under 2000 rpm so it's a bit of guess work.
doesn't show the diifference below that but it is even greater. I did have a stock 340 with the generic replacement
Melling 340 cam at .204 / .214 duration. That thing would pin you in your bucket seat at any low rpm and would break
the tires loose at low speeds as well. 3.23:1 gears
RPM Operating Range:1,000-5,200 Grind Number:XE256H Cam Type:Hydraulic Flat Tappet Lifter Style:Hydraulic Flat Tappet Camshaft Series:Xtreme Energy Usage:Street/Performance California Proposition 65:WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Advertised Intake Duration:256 Advertised Exhaust Duration:268 Intake Duration at .050 Inch Lift:212 Exhaust Duration at .050 Inch Lift:218 Intake Valve Lift:0.447 Exhaust Valve Lift:0.455 Lobe Separation:110
If you look at this 360, @ 2500 the stock 2bbl cam makes about 330 lbs-ft and the xe256h & xe268h makes about 380 & 370 lbs-ft respectively a good 40-50 lbs-ft over stock cam, at 2000 rpm the stock 2bbl cam is still about 330 lbs-ft, the other aren't dyno'd down there so it's a guess but the dyno graph you provided didn't drop off there so I'd it safe to guess there still a positive gain possibly not.
I could be wrong and it's all about the torque especially since we got to guesstimate and piece together what's happening down there but I not seeing any overwhelming evidence saying so.
