I know the flywheel on my Conquest weighed around 32-35lbs.
It's main reason for being so heavy was to make the engine smoother as the large bore (2.6L 4-cylinder!) and rotating weight were hard to keep balanced. (More for drivability then reliabilty IMO)
They even used this heavy flywheel AND balance shafts (POS!) to keep engine vibrations in line.
Machining the stock flywheel down to 24lbs (minus 8-10lbs) was nearly like putting a new engine in the car it's rev-ability was increased so much!
Also removing the balance shafts and internally balancing the engine was good for ~15-18HP.
