V(BB,1200): Early-Mid 50s white man. Tight. Only saw him play a couple hands in 2-3 hours

Hero(LP,Covers);Hero probably has tight image and doesn't have wide ranges.

MP(nitty) raises to 30, V calls Mp calls, Hero calls on BB with 66

Flop(120):976r
Hero checks. Nitty bets 175. V raises to 675. Folds to hero and Nitty folds out his turn(He didn't see hero's cards). Hero????

Gross. 240BBs deep with bottom set against an overbet and a giant raise with two tight players and relatively dry board? I usually will GII with bottom set, but this hand just seems weird as **** to me.

What can V have here that needs to raise on this board? 88/89s raising as a semi-bluff? Can't see much 8T in his range to call a raise in MP, and no reason to blow the nit off his likely overpair anyway. He also doesn't need to blow overpairs away with his sets, but big bets usually mean big hands, so I'd not discount them. Maybe some overpairs of his own that are spazzing.

In game, I'd likely GII. He's never raise/folding there, so I'd just shove. Against a range of sets, one combo each of 89s and 88, and 6 combos of overpairs (I gave him KK to represent a smattering of overpairs), we are almost exactly 50/50. With he dead money in the pot, it is +EV. However, this is very range dependent. Without the overpair in his range, we are crushed with like 21% equity.

Who is in what position here? Are you LP or BB? Is V BB or in MP?

This is relevant because I don't expect a tight V as described to call a big PFR with 98/97/96/87/76 type hands. PP make way more sense.

But if he's BB then he might be inclined to overcall with a SC.

Sorry, I messed up with position. Hero is in BB. Nitty is utg+1. V is UTG+2

I think folding might be best here then. V has only played a couple hands in the past three hours which means he's unlikely to call a big utg+1 raise with hands like 97 next to act. V is actually still in EP. He's so much more likely to call the raise with a PP.

When nitty over cbets pot and V raises huge (135 BB cold), he's saying he can beat nitty's perceived range, which is TT+. And V is unlikely to do this with 88. That leaves 99/77 as the most likely hands he could have given his range.

It's really hard to fold a set but when it's 240 BB deep, it's time to consider it.

Does V likely perceive "nitty" as nitty?

If so, I really think this has to be a fold, as tough as it is. Nitty just overbet pot and thus announced he has an overpair, so V's raise clearly says I can beat an overpair. Based on V's positions suited connectors seem very unlikely as tighter players usually aren't calling 6x raises preflop from EP.

This REALLY looks like 99 or 77 but I'm probably not good enough to get away from a set here.

Would villain raise tt, 98, 87 and 2 pair? If so we need to stack off.

It's really depends on how tight the villain is. I'd strongly consider a fold 240BB deep against a true super nit who mostly folds pre and almost never raises post. If he's been more active pre and post then I'm pretty sure I gii here. I'm not fist bumping though. I doubt a tight villain calls pre with T8/85. It's +EV to gii against a range of 77/99 and about 7 overpair or worse hands. I think there are enough TT/JJ/AA combos that play this way.