This is second hand info because I asked a friend that has a new pair of RPM 84cc heads to weigh the valves. He used a cheapo digital postage scale so the numbers are likely plus/minus a few grams.
Exhaust: 112g
Intake: 124g

Please post the E-street weights as I would like to know the difference as well. Also do you have the actual spring specs for the E-street?