[Exotic "SOUNDING", high revving V8! Read "ENTIRE" thread before posting!!!]

Do they create a bracket to offset the entire crank by the length of the stroke, thus making it rotate around the connection rod journals? This seems like it would vibrate at any significant speed, unless the crank is quite light. Additionally it doesn't seem like this practice would be very time efficient. Thoughts?

 

Good question...I've seen some very round-looking things come out of modern CNC milling machines without ever actually turning them on a lathe, but I can't imagine it would be accurate enough to meet desired bearing tolerances (especially at 16,000 rpm). If they do throw it on a lathe with an crank-length offset bracket as you suggest, they could dial down the cutting speed a ways to limit vibration, or mount some other offset weights on the crank temporarily to balance it. Of course, it's been over a decade since I've done any machining, so who knows what's possible now.

[LS1 vs iron SBC weights]

There's a fairly extensive weight breakdown of the LSx engine components in this thread:

 

http://forums.corvetteforum.com/showthread.php?t=984927

 

(scroll down a bit)

 

Each weight # has a link to the source, it seems fairly thorough.

 

-Stephen M