Since the new 3.7L engine is simply a bored out version of the 3.5L engine, how reliable do you guys think it'll be?

It's a stroked version, not bored out. Shouldn't affect reliability. Nissan has always built reliable engines. The more concerning thing would be the new valve technology, but I'm not concerned. Valve timing and lift control has been done for over a decade now by most competitors.

While that's true, this technology isn't simply variable vale timing. Like BMW's Valvetronic, it eliminates the need for a butterfly throttle valve. That said, I would not worry at all about the reliability of this engine.

It's been a long time since Nissan produced an unreliable engine. I doubt this will be break that tradition.

I've owned Infinitis, BMWs and Porsches, and the Infiniti is the only car that I would consider owning without a warranty. Enough said.

Which 3.5L? The reliability isn't known on these new HR engines and compared to the old VQ (last gen coupe), these engines are 80% new. Its too soon to tell. The rev-ups on the previous engines are known for oil consumptions so realibility isn't so good on those. the older non-rev ups are still really reliable.

The 4.0 litre in the Pathfinder is a stroked version of the 3.5 litre VQ35DE. It is quite reliable. Nissan seems to know what they are doing with the tweaking of this motor. And they most certainly don't want to diminish the reputation of the VQ.
as EZZ stated however, we won't know completely about the new version until time passes by.

Didn't Nissan beef up the internals? If so, then the engine should be pretty stout. Remember, this is the same NA powerplant going into the GTR....

i wont doubt the reliability.. it's the lack of moding potential that will have most upset!! looks like they are sorta following bmw's foot step of going high end hp, low on torq, and high reving.. with super high compression!!

Low torque is not good on a heavy car like the G37. High HP probably sells cars but in reality it means little on the street where torque is king.

That used to be true...but the N54 engine puts out 300lb/ft of torque at 1400rpm. The torque actually drops off at 5500rpm, so it's kind of the anti-high revving engine.

not to get off subject, but in terms of torque, the specs released on the new M3 engine are right in line with ^

"The M3 will also carry 295 ft-lbs of torque, 85% of which is available at 2,000 rpm."

That is low for a 4.0L V8 with over 400 HP, but just like some of their other machines, it is almost all available low end.

Torque consistently even throughout the rev-band is better than massive torque down low and falling off up top. That's why the E46 M3 with only 268 ft/lbs and a weight of 3500 lbs can do 0 to 60 in 4.9 and 1/4 mile in 13.6 and it matches the 335i. Of course gearing has alot do to with it to, but the 268 ft/lbs is available thoughout the entire band and very flat. I want to see the 3.7's dyno, but I bet the torque is alot flatter than the 3.5, which peaks at 4800 rpm.

Massive torque numbers are common in GM V8s with low redline and huge displacement. Take a look at the high tech V8s from Ferrari, Lambo, and BMW you'll see high revving, low displacement engines with not alot of torque, but they work.

I had no idea 270lb.-ft. of torque with an extremely flat torque curve is "low" now.

nissan didnt have its V6 engine win top awards 10+ years running for no reason.. if its a nissan V6.. i wouldnt worry about a thing.