If those 440 Magnums & Six Packs were poorly balanced from the factory, they sure went well & I do not recall owners complaining. They also seemed to last for tens of thousands of miles.....
As long as the owner matches the piston weights, in my opinion, the engine will be fine for it's intended use. If he did get the assy balanced, I doubt he would notice a before/after difference, except for a lighter wallet....
I tend to agree. Many manufacturers engines go 100s of thousands of miles on factory balance. I have road raced many stock engines, revving all thru the range as high as 7500 rpm, and never had an internal engine failure.
