So far in my car, I've swapped to an SFI chromemoly flexplate. Not sure what, if anything this did. But I plan on swapping to aluminum drums which I've read is worth about 10lbs. i also want to swap in an aluminum driveshaft which is another 4. Eventually, I want to ditch my 12" converter for a 10" which is worth another 6 - 8lbs if i remember correctly.

Can anyone else think of any other ways to reduce rotational mass? And what kind of difference can I expect from all this?

 

There are more ways, but they start to drastically decrease reliability. Gun drilled axles, light weight gear sets, etc.

Also, when time comes for the motor to be rebuilt, a lightweight crank makes a difference.

Some people might say harmonic balancer. However, a well built harmonic balancer that dampens crank harmonics is better then some cheapo light weight unit.

Oh and are you already running lighter weight wheels?

 

gun drilled axles and lightweight gears are out of the question. if this was a strip only car of course but a street car I'm not gonna take that sort of chance.

The motor only has about 10k on it so a rebuild is out for quite some time...

To the best of my knowledge, my rims are stock 15" aluminum ones. Is there anything better than this?

 

Im not exactly sure on the wheels. I know there are lighter ones, but I dont know how much. But then again, not really needed for the street. Strip only car could see some benefit.

Also could look at aluminum pulleys, a/c delete, manual steering, smog delete, etc.

Carbon/aluminum driveshaft. You should see a big improvement when you swap to a smaller converter diameter.

Might want to start watching unsprung mass too. Good benefit there as well.