| what that means is: when they make the piston it starts out cast then they put it in a die and compress it to it's final size, this makes it more dense. That means stronger ring lands and higher resistance to shattering. The downside is you would have to build the motor looser than stock which makes it noisy when the engine is cold, because there is more material occupying the same space it expands to a larger size when it is heated up. I wouldn't bother with forged pistons if you're shooting for stock turbo power. The stock coolant passages are more than enough for stock power so I wouldn't bother with boring them out either. Knife edging the crank is harder than it sounds, balancing it would become a nightmare. Taking material away from anything usually makes it weaker, especially if you take it away from the wrong place. I believe the entire crank is shot-peened or nitrided so removing portions of the outer surface would be removing that shot-peened goodness that makes our cranks such beasts. The inner layers of the crank is left softer than the outer layer because a perfectly rigid crank would shatter from the vibration. If you have access to a crank balancer, and you have someone to re-forge the crank where you removed the hardened outer layer.... and you have no life then go for it. You might also want to look into bearings, harder bearings wear out much slower but are easier to damage with particles in the oil, softer bearings (like oem) wear out faster but if dirt gets in the bearing is more forgiving. The way I would build a motor is: I would have an engine builder make me an engine building kit, basically have them do all the measuring and machining then have everything (legos) sent back to me so I can put it together. The vg30de is a very unforgiving motor to rebuild, if you want to start on a SBC you can basically do the whole thing in your garage, you can almost put everything together wrong and it will still work just fine lol, that would be a better first rebuild IMO.
*disclaimer*: all that I say may be true or I may be completely wrong and I accept that.... please, it is your duty as another person on the internet to impolitely tell me how wrong I am :) "The dreaded 2nd windshiled wiper swipe when you turn it off its almost like tis showing you that it's boss, and it doesn't have to stop when you tell it to :("-College Boy (discussion on ptu relocation)
"No good reason to put it there anyway. -Bernie (NoVA)
False -vorpalZ
False. -Bernie (NoVA)
You're correct, there are 3 good reasons -vorpalZ
False. -Bernie (NoVA)
Wow, right again, just remembered another, make that 4 -vorpalZ"
XD 
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