Roller LA Deck Height

The Wallace calculator has only one purpose,well two
to predict low rpm performance, and to be able to compare different combos.
The P/V numbers that it generates are directly comparable across all engine sizes, and you can work them as pecentages.
So if you have a slanty with a PV of 87 you know she's a dog. But if you have a 416 with a PV of 180, you know that's a hot engine. But you already knew that, you didn't need the PV to tell you that.
But the PVs in the middle , from 125 to 150 ish are gonna make or break your combo, and when you spend $5000 smackers on an engine, you want some performance for you trouble, am I right?

So since I have run three different cams in my engine, I can be confident in saying that I am very disappointed in a PV of less than 130; and that I really like a PV in the range of 140/150, and that more than 160,on the street is sorta killer crazy. I run a Commando 4-speed with 3.55s, and BFG 295s. .
Here are some stock PVs for Mopars at 700ft.

318 is ~113 @8.0,Ica of 48*...................... base
360 is ~123 @8.0,Ica of 52* .............. +8.84% over 318
340 is ~134 @10.5,Ica of 64*............. +7.94% over 360
My 367 at 930ft ~164 @10.95, Ica 60* +22.4% over 340
My 367 at 5500ft ~143VP ...... LOSS of 12.8% over 930 ft
440M ~146@10.5@Ica of 72*,Magnum circa 1968, FWI
Now, remember I said you can compare the low rpm performance of any engine to any engine by the percentage in PV difference. So I added another column so you can see it, under "base".

Remember this calculator has nothing to do with horsepower, which does not occur until a much higher rpm. This VP is a stall to 3000/3600 rpm number depending on what you are comparing it to.

Read about VP here
V/P Index Calculation