THOSE 4 cc's are HUGE!!!
The 4400 will spank the 4000 AND the 245 resoundingly!
A couple of years ago Brad Snelling ported a 245 and it ran really well. When put to the test against my stock 4200, the 4200 beat the ported 245 soundly.
Now, lest anyone think I'm trashing the 245, nothing could be further from the truth.
I love the 245 and it is one of the very few saws that I am still looking to add to my collection.
For power to weight, the 245 is still in the hunt after all these years, but brute power doesn't always compare favorably to power AND chain speed.
Andyshine77, Fatguy and I did an impromptu test a few years ago on one of my 4200s and the saw tach'ed out at 10,500 out of the cut. It lost 100, yes that's right ONE HUNDRED, rpm's in the wood!!!
With a 28-32 inch bar, I believe the 245 will get a lot closer to the speed of the 4400 but I don't think the 245 will ever out cut the 4400.
JMHO
And yes, I compare the 4200/4400 vs. the 4000 or 245 to the difference in a 400 small block and a 396 big block. The 396 may have less displacement, but there is simply no comparison in the power.
Mike
Wow that is impressive. Only 100 rpm's drop in the wood. You have really got my attention now.