Bob, I have some of that info from the Herb Adams book.

What I have shows a test between Static and Rotating weight of 15# Off the car, wheel, and crank.

And by Far 15# of the crank was worth about 15 times as much as 15# off the car/dead weight.

It appears Herb took a 3000# car and accellerated it from 64 MPH for a marked or timed distance. Dropping 15# first off the car, and then at the wheel and finally from the crank itself.

Then by comparing the MPH change they calculated the approximate HP change that would of taken place.

With a base line of 428 HP on a 3000# car the accelleration tests showed a gain of

2.14 HP equivalent from a 15# deadweight drop.

6.42 HP equivalent from a 15# wheelweight drop.

32.10 HP equivalent from a 15# crankweight drop.

This from the old Herb Adams Chassis book. As far as its accuracy, I dont know. But it sure does imply that the best place to remove weight is in the engine rotating assembly.

So with a 40# weight loss at the crank you should definately see and feel something, mike