AAM Competition 370Z & G37 Stage 4 4.07L to 4.3L Short Block Engine Package
The AAM Competition Stage 4 VQ37 Shortblock is the ultimate engine block setup for those seeking maximum power output. This 4.07L to 4.3L stroked and sleeved motor is ready for 1,000+ whp (with optional proprietary block strengthening).
The added displacement of the stroker kit greatly increases low-end and midrange power. On boosted application expect the turbochargers to spool up 300 to 600rpm sooner than a comparably setup non-stroker engine.
The AAM Competition Stage 4 VQ37 Longblock comes with a full one year warranty against machining defects.
- The strongest, best optioned engine package available for the VQ37VHR
Capable of supporting 1,000+ whp
Larger displacement spools turbochargers faster
Larger displacement increases torque
- Forged Steel Billet Crankshaft
Forged Racing Pistons
Pro Series Rods
Installation Instructions can be downloaded here.
What compression ratio is right for me?
AAM Competition offers both 9.0:1 and 11.0:1 compression options for many of our VQ37 Engine Build Packages. 9.0:1 is a lower compression ratio than that of the factory-spec engine, making it ideal for forced induction applications, such as supercharger, turbo, and twin turbo setups. 11.0:1 is a higher compression ratio than the factory-spec engine, making it a great option for naturally aspirated builds looking to make more power and/or take advantage of higher octane fuels.
What is a “core charge”?
A core charge is an expense that is added if the customer does not wish to send in core units (engine block and/or heads) to be built, or the returned core units are not complete or are not in rebuild-able condition. In order to be eligible for a refund we must receive your core(s) within 30 days of when your AAM Competition product shipped to you. All cores will be thoroughly checked and tested upon arrival at our facility to determine their condition. The amount of your refund will be determined based on the condition of the core and is at the sole discretion of AAM Competition, LLC. See AAM Competition’s Terms and Conditions page for more information.
What’s the expected turn-around time for a VQ37 engine package?
Turn-around time depends on many things, including the specific stage/level of your desired engine package and availability of components. Upon receiving useable cores, AAM Competition is able to complete most engine packages within 3 – 6 weeks, but this timeframe is not a guarantee and may vary. Our current workload will also play a role in determining a timeline for project completion.
Can an engine package be built without using my core components?
Yes! AAM Competition is able to put together an entire motor using a new OEM block and/or OEM heads at your request. Although this option is more expensive and will require you to pay the associated new block/head charges, it will allow AAM Competition to build you a new motor without having to send any components to us to be re-used. Please contact us to find out more information regarding the availability and expected order times of OEM engine components.
A Shortblock is the lower portion of the engine, the "block", which houses the crankshaft, rods and engine pistons. A Longblock is the Shortblock with the cylinder heads attached to the short block - the cylinder heads are bolted and professionally torqued with a head gasket and head studs to the shortblock. The Longblock does not include the installation of the timing assembly (ie. timing chain, tensioners, etc.), pulleys, and other engine accessories such as the intake manifold. For an additional charge we can "complete" the Longblock with the timing assembly and any other accessories requested for an additional charge. It is recommended to replace the timing assembly when rebuilding an engine.
How is the power rating established for the different engine stages?
The power ratings (whp and engine hp) are general guidelines of the maximum power the engine may be able to support and varies considerably depending on the quality of other components utilized in the vehicle’s overall build. This includes the quality and reliability of the vehicles fuel system, engine management, tuning, octane/quality of fuel, etc. which all play a significant role in the vehicle’s ability to support up to the maximum power rating.
Where can I find details about the limited engine machining defect warranty?
Please see AAM Competition’s Terms and Conditions page.
Parts used for AAM Competition engine packages are subject to change depending on availability. AAM Competition, LLC may also update parts listed from time to time in our continuous effort to provide best quality products to our valued Nissan and Infiniti enthusiasts.
AAM Competition Financing!
Buy Now, Pay Later with Blispay
Blispay makes shopping at AAM Competition, LLC even easier. It’s the only payment option that gives you:
6 Months to Pay
No Payments, No Interest on purchases over $199 if paid in full in 6 months.
2% Cash Back
Blispay gives you 2% Cash Back on all purchases and works everywhere Visa is accepted.
How it works:
Apply on your phone or computer at https://blispay.com/aamcompetition.
If approved, you'll receive a digital Blispay Visa card which can be used to make purchases with us.
You’ll receive 6 months special financing on all purchases over $199 + 2% Cash Back.
Interest will be charged to your account at your APR of 19.99% from the posting date if the purchase balance is not paid in full in six months. Your account has a 3% foreign transaction fee and if you are charged interest it will be at least $2.00.
For more info please visit blispay.com/faq.
The Blispay Visa® Card is issued by First Electronic Bank, Utah.
Learn more and apply now at blispay.com/aamcompetition.
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