check www.wizardofodds.com, as far as i remember they do not advise surrendering with a 16 vs. dealer 8
If surrender returns only 50% of your bet, then at a count of zero, you should hit 16 against an 8, not surrender.
If surrender returns 57.1% of your bet ($2 off a $3.50 bet, which is what this guy was talking about) then you should surrender a 16 against an 8 at a count of zero.