400 raise the river as a bluff, pretty or braindead u decide

[Knock*u*down]

Just sat down an orbit ago. villian seems standard tag from his stats but no special reads. Please comment on flop and espicially on the river. My reasoning was he has never ever a set because he checks the turn and bets only half pot when flush hits and he has fullhouse. Flushdraw seems also a bit unlikyly since he most likely has overcards and would many many times 3bet the flop sb vs bb.

Prima Poker skin
No Limit Holdem Ring game
Blinds: $2/$4
6 players
Converter

Pre-flop: (6 players) Hero is BB with 6[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img]
4 folds, <font color="#cc0000">SB raises to $12</font>, Hero calls.

Flop: 3[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] ($26, 2 players)
<font color="#cc0000">SB bets $20</font>, <font color="#cc0000">Hero raises to $52</font>, SB calls.

Turn: 2[img]/images/graemlins/heart.gif[/img] ($130, 2 players)
SB checks, Hero checks.

River: 2[img]/images/graemlins/diamond.gif[/img] ($130, 2 players)
<font color="#cc0000">SB bets $66</font>, <font color="#cc0000">Hero raises to $176</font>,