Does anyone know the actual real weight difference between a 470 and a heavy case 520?

I have found that the O-470 around 430lbs and the IO-520 at 470lbs. Just quick search.

Steve Knopp says about 35 lbs for the big case or 12-15lbs for the bigger cylinders in an 0470 core = 0470-50. I used my old core as it was good to go.

AKT

For some reason I could not copy paste this so I'll try a pic.
Looks like there is close to 30lbs difference in just the O-470 series.

Not enough to make a heckuva difference--that's what one mechanic said to me.

Cary

Thanks guys. Didn't realize so much difference in just the 470's even! I know it's not much difference but when your trying to stay light, 30-50 lbs n a motor, 10-30 on prop variations is a lot to me on the nose. All of it is not much if its all by itself. (; thanks guys.

Steve Knopp says about 35 lbs for the big case or 12-15lbs for the bigger cylinders in an 0470 core = 0470-50. I used my old core as it was good to go.

AKT

Does that mean then about 50lbs for 520 heavy case? Cause that is what you have right?? Saw you had the humpback case.