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TERMS & CONDITIONS, Warranty, Emissions Statement 8/12/2022

A full copy of our terms and conditions can be found here.

By purchasing from our website or over the phone you agree to the below terms and conditions, last updated 08/12/2022.

Limited Warranty

Unless otherwise specified no warranty is expressed or otherwise implied for Mast Motorsports products. Due to the nature of motorsports and racing we do not offer a product warranty unless otherwise noted.
Component Workmanship limited Warranty

Mast Motorsports offers a workmanship guarantee that applies to engines and components specifically manufactured by Mast Motorsports LLC. Whereas, Mast will fix, replace, or substitute components it expressly manufactures in case of workmanship flaws. This applies to Mast manufactured components for 6 months after sales invoice date. No refunds or exchanges on engines or components allowed. This limited warranty does NOT apply to components purchased from vendors or other manufacturers.


Engine Workmanship Limited Warranty

Engines assembled, machined, & tested by Mast Motorsports are warranted against workmanship issues or failures for 12 months after final invoice date.

Any and all warranties are null and void if the engine is disassembled by personnel other than approved Mast Motorsports Technicians, prior to any warranty claim.

Due to the vast nature of components used, Mast cannot warrant component failures. Due to the nature of racing and competition use, this warranty does not apply to engines used in racing or competitive motorsports activities, or engines rated above 650 HP. The limited warranty only applies to engines completely assembled and dyno tested by Mast Motorsports. No warranty expressed or implied on partial engines, short blocks, or other partial assemblies of engine components.

It is highly recommended that our customers use only Mast Motorsports Approved oil where applicable, failure to do so may void any and all warranties. Contact Mast for a list of approved oil.

All Limited Warranties are non-transferable, without written approval by Mast Motorsports.

Any agreed upon warranty will be covered by replacement components or any combination of labor and components. No refunds will be given.

For warranty claims, customer must provide in writing, within 30 days of issue, a statement of the issue, supporting pictures of issue(s), original sales receipt, mileage of engine, proof of proper oil & oil changes.

Mast is not liable for any subsequent damages to property, equipment, or related hardware.


Payments, Invoicing, Surcharges

Mast Motorsports works to provide only premium products and performance to our customers. Due to the nature of motorsports and lead time for custom engine parts, it is required to take deposits to kick engine builds off. Below is our payment schedule, and payment details

  • Deposit Schedule
    • In Stock - Factory Mast Crate Engines Require 100% Payment
    • Pre-Order – Factory Mast Crate Engines Require 50% Payment
    • Custom Black Label Engines up to 650 HP Require 50% Deposit
    • All engines 650(+) and all Supercharged engines require 75% of the invoice at time of purchase
  • Final invoice will be sent when engine is finished assembly, and ready for dyno testing
  • Final Payment is due within 15 days of invoice, engines will only ship once payment is received.
  • Late Payment greater than 30 days, will result in 5% surcharge of remaining amount due


  • Once engine is paid in full, we will store your engine for up to 30 days without storage fees.
  • After 30 days, storage will be $30/month.
  • Completed engines that are stored for the customer, are to be paid in full within 30 days of invoice date without penalty.


  • All deposits made for engine builds can be refunded 100% within 30 business days.
  • Pro-Rated Deposit return. For any cancellation, the deposit will be refunded at a pro-rated return after 30 business days. The pro-rated deposit refund schedule will deduct $50/day after initial 30 day period from initial deposit


Any completed engine and components for engine build not paid in full within 60 days of invoice will be forfeited to Mast Motorsports. This includes any and all deposits and customer supplied components. Mast motorsports reserves the right to sell the engine to recoup any monies owed for completed engine.


Shipping & Freight


You just received awesome stuff from Mast, we thank you! Please check for damage WHEN YOU GET YOUR PACKAGE! We work hard to protect our products for shipment, shipping companies have a lot of ain’t care.

Mast Motorsports ships with various carriers. When shipping packages under 100 lbs – Mast uses UPS & FED EX, Mast insures packages for any losses or damage to due to shipping company errors. All packages should be reviewed for damage and reported immediately to Mast Motorsports. If damage is not reported to Mast for any claims within 7 days of receipt, Mast is not responsible for carrier insurance claims for loss or damage.

Mast cannot guarantee shipping carrier insurance claims, but will work diligently to pursue claims for loss or damage for the customer.

Engine shipments are shipped using common carrier freight. All freight shipments are insured for damages. All damages must be reported within 3 days of receipt of freight shipment.

Engine Crating and Packaging

All engines are shipped with a steel re-useable engine cradle, and custom crate to protect from damage.

Engine Flat Rate Shipping

All shipments to the continental USA will be $650 which includes freight shipping, crating, initial oil change kit, and engine cradle. If you require lift gate at your receiving location an additional fee of $150 applies. If you arrange shipping, the engine crate fee is $250.

International shipping

The customer is responsible for any additional fees, tariffs, duties, fines related to international shipping


Returns & Refunds

Mast will accept returns of components and items within 30 days of purchase. Customer must call & request RMA number prior to returning parts. Mast will review returned merchandise and credit customer where applicable within 30 days of receipt of return.

No Returns or Refunds are accepted for engines, engine assemblies etc.


Mast Motorsports MAP (Minimum Advertised Priced) Dealer Policy

Mast represents its brand as premium and custom tailored to the performance market. Mast demands our dealers represent our MAP policy at Retail/Website Price as the minimum advertised price.

Pricing is noted as Retail/Website price on price sheets or on Mast’s website. Violation of the MAP policy, will result in one Written Warning to comply within 45 days, if the dealer fails to implement the MAP policy, the dealer will forfeit it’s discount, until dealer complies. Mast at its discretion, may disallow discounts of any type, and use of it’s trademarks, tradenames, or any intellectual property owned by Mast or its subsidiaries.


WARNING: It is illegal to install any aftermarket part that alters or modifies the original design or performance of the motor vehicle pollution control system unless the part is exempted or has an Executive Order issued by the California Air Resources Board (also commonly referred to as the "EO" number). Installation of parts which are not CARB approved on a pollution-controlled vehicle in the State of California may result in the Department of Motor Vehicles (DMV) revoking the vehicle registration and certificate of ownership (title), refusing the transfer of registration, and/or the vehicle failing smog inspection. Law enforcement may cite you for the use of an illegal aftermarket part and seize your title and license plate.