Anyone using beehive valve springs on a slant-6?

If you want the lightest factory stuff, you will need to look at the cast crank engines.
Using a digital medical scale, I weighed a cast crank (1979) at 63.2 lbs and a forged crank (1965) at 75.2 lbs.
the cast piston/rod assy was 2.6 lbs-no rings or bearings, while the forged crank set was right at 3 lbs (no rings or bearings)
I weighed the following on a cheap postage scale:
Rocker arm (solid lifter)-150 grams
dirty stock intake valve-103 grams
dirty stock exhaust valve-88 grams
clean 1.78 intake valve-111 grams
clean 1.51 exhaust valve-101 grams
dirty OE valve spring-72 grams
dirty OE retainer-25 grams
dirty OE keepers (pair)-4 grams
new cast crank rod bearing(pair)-42 grams
new forged crank rod bearing(pair)-58 grams

I'm jus' sayin'