Not sure if its any use to us, but it might be good to be able to take to the machining shop (what I intended to do with it)

http://www.datsport.com/Flywheel.html

hope its of some use, but might pay to check it out before you go to these specs

Several months ago, I needed clutch work done on my Z32. In addition to the centerforce clutch I had 6 lbs taken off the flywheel per the recommendation of a friend. WOW!! When I picked up the car I found my shift rpm's had increased 900 to 1000 rpm! What a difference in engine performance!

Almost like the time I had the timeing belt changed. I thought the mechanic had bumped the timeing up as the response had improved so much? Not so, the old belt had streached over the 75,000 miles and the new belt put the timeing right back on the mark. Just had not noticed the slower response over the years.

SilverBullet240 remains stock for the present.......

You asked for the cons, I would say there are a couple cons but the pros are worth it.

1. You could damage the flywheel and it may come appart. Lightening a stock cast flywheel can be tricky business and best left to the experts. Make sure it is properly balanced.

Lightening any flywheel while give you worse gas milage. I don't know how much but I wouldn't care.

I have collected a coupe extra flywheels and plan to have one lightened one of these days!

Have fun!

Oh yeah, and start with a flywheel in good condition!