VQ37VHR Engine Guide: Specs, Common Problems and Model Fitment

The VQ37VHR is one of Nissan's most respected V6 engines, and for good reason. It powers the 370Z, several Infiniti models, and it still holds up well against newer turbo engines. Owners like it because it is naturally aspirated, which means less to go wrong compared to a turbo setup, and because it just sounds good doing it.

If you are researching a replacement engine or planning a swap, here is everything worth knowing before you buy, from specs and fitment to the problems actually worth watching for.

What is the VQ37VHR?

The VQ37VHR is a 3.7L naturally aspirated V6 from Nissan's VQ engine family. It is known for a strong exhaust note, smooth power delivery, and real longevity when maintained properly. It has appeared on multiple "best engines" lists over the years, and enthusiasts still rate it highly even as the rest of the market shifts to turbo four cylinders.

Where it sits in the VQ family (VQ35DE to VQ35HR to VQ37VHR)

The VQ lineage started with the VQ35DE, moved to the revised VQ35HR, then grew into the VQ37VHR with more displacement and updated technology. Each step brought more power and smoother delivery.

What VVEL actually does

VVEL stands for Variable Valve Event and Lift. In plain terms, it constantly adjusts how far and how long the intake valves open, which lets the engine make better power across the whole RPM range instead of just at the top. This is a big part of why the VQ37VHR feels responsive at low RPM but still pulls hard near redline, rather than needing to be revved out to feel strong.

VQ37VHR specifications

Figures come from Nissan and Infiniti technical data. Output varies slightly by trim and model year.

Which cars came with the VQ37VHR?

Nissan 370Z (Z34)

The 370Z is the engine's most famous home, offered with either a 7 speed automatic or a 6 speed manual with SynchroRev Match, which automatically blips the throttle on downshifts. This is the version most swap builders are chasing.

Infiniti G37, Q40 and Q60

These share the same core engine as the 370Z, tuned slightly differently for a more luxury focused feel. Power figures are close to the 370Z but usually a touch lower, and the driving character leans more relaxed.

Infiniti M37, Q50 and QX70

These larger, heavier models use the VQ37VHR too, usually with slightly different output figures due to their size and drivetrain. Some of these applications are rear wheel drive and some are all wheel drive, so fitment details matter more here than in the 370Z lineup.

How much power does the VQ37VHR make?

Most 370Z models make between 332 and 350 horsepower depending on the model year and whether it has the SynchroRev Match manual. Infiniti applications generally sit close to 328 to 330 horsepower. These are factory figures, not tuner claims, and they can vary slightly by region and emissions requirements, so always confirm the number for your specific model year.

VQ37VHR vs VQ35HR vs VQ35DE

If your priority is peak power and smoothness, the VQ37VHR wins. If you want a simpler, slightly older engine that is easier to source parts for on a budget, a VQ35HR can still be a solid buy. Neither choice is wrong, it really comes down to what you already have and what your budget looks like.

Common VQ37VHR problems

No engine is perfect, and the VQ37VHR has a few documented issues worth knowing before you buy. None of these are secret, and they are worth asking about directly rather than avoiding the engine altogether.

Oil consumption and oil gallery gaskets

This is the most talked about issue with the VQ37VHR. Some early units used oil gallery gaskets that degrade and cause consumption between oil changes. Check the service history for this repair, and if you are buying a used engine, ask directly whether it has been done.

VVEL actuator and ladder faults

The VVEL system is complex, and actuator faults can trigger rough idle or a check engine light. This is not extremely common, but it is worth checking on higher mileage units, especially if the car has stored codes related to valve timing.

Timing chain and tensioner wear

Chain and tensioner noise can appear at higher mileage, often described as a light rattle on startup. It is usually not urgent but should be checked and addressed before it gets worse.

Heat management in hard driving

The VQ37VHR runs hot under sustained hard driving, especially in the 370Z where the engine bay runs tight. Keep an eye on coolant condition and cooling system health if you track the car or drive it hard regularly, since heat is one of the bigger long term stressors on this engine.

Is the VQ37VHR a good engine?

Yes, with the usual caveats. It is a strong, responsive engine that holds up well with regular maintenance. The main things to watch are oil consumption and cooling system upkeep. Buyers who service it properly tend to keep these engines running well past 150,000 miles, and it remains one of the more trusted naturally aspirated V6 options in its class. Compared with turbocharged alternatives, it also tends to be cheaper and simpler to maintain long term, since there is no turbo, intercooler, or extra plumbing to worry about.

Replacing a VQ37VHR: what to check before you buy

Buying a replacement engine sight unseen is stressful, so here is what actually matters before you commit.

Mileage, compression and leak down

Ask for compression numbers and, ideally, a leak down test result before buying any used VQ37VHR. Mileage alone does not tell the full story.

Matching the ECU, harness and transmission

The ECU, wiring harness, and transmission all need to match your specific application. A 370Z engine will not simply plug into a Q50 without the right supporting parts, even though the engine itself is essentially the same unit under the covers.

RWD vs AWD applications

Some Infiniti models use AWD, and those engines pair with different accessories and mounts than the rear wheel drive versions. Always confirm drivetrain before ordering, since this is one of the easiest details to overlook when buying from a listing photo alone.

See VQ37VHR engines we have in stock once you have confirmed your exact application.

FAQs

How much horsepower does a VQ37VHR have?

Factory output runs from about 328 horsepower in some Infiniti applications up to around 350 horsepower in the highest trim 370Z models.

Is VQ37VHR the same as VQ37HR?

They are the same engine family. VQ37VHR is the full name, and VQ37HR is a variant spelling used in some listings, so both terms point to the same engine.

How many miles will a VQ37VHR last?

With regular oil changes and cooling system maintenance, many owners report well over 150,000 miles without major issues.

Can I swap a VQ37VHR into a 350Z?

Yes, this is a popular swap, but it requires the correct ECU, harness, mounts, and often transmission changes. It is not a bolt in job, so budget extra time and money for the supporting parts, not just the engine itself.

What does a replacement VQ37VHR cost?

Pricing depends heavily on mileage, testing, and whether it comes with the transmission. Used and tested units are almost always cheaper than a dealer replacement or a brand new crate engine. Call us for current stock and pricing on tested units.

Conclusion

The VQ37VHR earns its reputation as one of Nissan's best V6 engines. It is powerful, refined, and reliable when it is maintained. If you are replacing one or building a swap, get the compression numbers, confirm your exact application, and match the ECU and harness correctly before you spend a dollar. Rushing this step is the fastest way to end up with an engine that almost fits your car. Call (407) 412-5888 or send your VIN for a fitment check, and we will help you find the right VQ37VHR for your car, backed by our standard warranty terms.