5/10 - is this bluff ok?

[Dazarath]

Villain is MT UR Wallet. He's been stealing a lot and neither me, nor the two people after me have been defending much. I called a couple times, but I felt the flop dictated that I C/F. Is this bluff ok?

PokerStars No-Limit Hold'em, $10 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($1000)
UTG ($2907)
MP ($1323)
CO ($985)
Button ($195)
SB ($4010.30)

Preflop: Hero is BB with 8[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">SB raises to $40</font>, Hero calls $30.

Flop: ($80) 5[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $60</font>, Hero calls $60.

Turn: ($200) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $155</font>, Hero calls $155.

River: ($510) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $280</font>, <font color="#CC3333">Hero raises to $745</font>

[raptor517]

i like i think

[RiverHebrew2]

nice; looks like block bet from him