I've seen A LOT of posts about making HP with a 318-So why is it so ???

PRH said
I haven’t, but it would be interesting to plug in some numbers and see what it says.

Here’s another big cube/smallish head comparo.......
572, 10.7:1, EZ-295 heads, solid roller, 266/272-110, .672/.645, single plane, 1.560 venturi 4150 carb.
DD shows 664tq/615hp
Real dyno shows 719tq/715hp

That’s 55ft/lbs and 100hp low.

If you were using the data from the DD to plan the build to make over 700hp....... and it’s showing you’re at 615hp...... how much stuff do you change to make the program spit out 700hp+?
That DD2000 program will steer you wrong for that type of build.

Way back when , I'm talking late 90's I was young and super gung ho about high performance NA builds, I purchased an early version of DD. I spent hours playing around with various parameters and marveled over the results. I had the "good" version that you could run a camshaft iteration and it would "try" all of the camshafts in the world and it took a couple of hours too before it would spit out the "best" cam. So as usually happens you start to hang out in like minded circles of people and another guy I came to know had the same version of DD. I had an idea to test its accuracy one night and got on the phone--yes an actual land line. I called him up and we both got on our computers-yes desktops and we ran the EXACT same builds and guess what?? We saw two DIFFERENT results! Over and over again we tried--sometimes they came up the same, others close and others again very different. It was that evening that I gave up on DD. I figured the tech just wasn't there yet. In the meantime I've amassed flowbench and dyno experience --as well as what I read and hear because I'm still "into" it and can extrapolate pretty close to what can be expected out of certain builds that are in my wheelhouse. So NO I do not use or own any dyno simulation programs. Do I have faith in them-yes I do. I have a FB friend that works for Tony Stewart and his entire role is dyno simulation and he has told me that it is within 3-4hp of real world results on a NASCAR engine. The software he uses costs a lil more than anything us common folks has access to. I'll stick to the real world but I'm lucky and have a real dyno and flowbench to build my database with. Then again I'm no UT. J.Rob