American Speed warrants their engines to be free of defects in material and workmanship as specified: All engines from 275 hp thru 550 hp carry a 2 year/24,000 mile warranty from date of delivery. All engines street driven from 550+ hp thru 800 hp carry a 1 year/12,000 miles warranty from date of delivery.


All GM Performance engines carry a 1 year/12,000 miles warranty from date of purchase.  For authorized engine warranty, engine must be returned to American Speed freight prepaid. 


What American Speed warrants: 


All internal lubricated parts including pistons, rings, crankshaft, bearings, lifters, timing chain, valves, valve springs, push rods, rocker arms, seals, engine block, intake manifold, oil pan, dampner. Does not include any other parts other than what is supplied in long block assembly. Seals and gaskets are replaced only as part of a repair.


What is not covered by American Speed:


1. Bolt on accessories such as carburettors, fuel injection, distributor, ignition, water pump, fuel pump, alternator, power steering, air conditioning compressor, starter, and accessories drive systems. These parts are covered under respective manufacturer’s warranties and warranty period may vary. American Speed can act as an agent for these warranties.  


2.  Engines subject to neglect, abnormal abuse, lack of maintenance, collisions, abnormal operation, or acts of God.


3.  Operation of the engine with fuels, oils or lubricants that are contaminated, or not suitable for the engines such as some synthetics. 


4.  The use of accessories or other bolt on performance parts not manufactured approved by or installed by
American Speed.


5.  Modifications to engine not approved by American Speed.  


6.  Use of nitrous oxide.  


7.  Engines used for competition track or any racing purposes. 


8.  Engine failures caused by overheating, lean fuel conditions, poor quality fuel, improper ignition timing (i.e. deto­nation). 


9.  American Speed does not cover parts, gaskets, etc. damaged by detonation.  


10. American Speed does not assume responsibility for towing charges; lay-up time, lodging, telephone charges, car or truck rental, or any other charges created by an engine failure.


11. American Speed does not warrant damages to customer’s vehicle that is engine related. The buyer assumes full responsibility for entire cost of repairs to service damage, and/or loss of property.  


12. All warranty work must be performed by American Speed. Any warranty work not performed by American Speed must be performed by a certified mechanic with prior written authorization by American Speed.


13. Service or diagnostic work performed by other individuals or companies.


14. Installation or removal of engines or related parts or any resultant labour charges.


15.American Speed does not warrant electrical components or alternators.


16. American Speed does not warrant A/C compressors without factory inspection. 


17. American Speed does not warrant ECU's or any fuel injection computer for electrical failure.


18.  American Speed does not warrant mal performance or engine damage caused by self-re-programming or alteration of ECU's


Warranty claim rates will be paid according to Mitchel's Auto Labour Guide.




American Speed will pay freight charges on all legitimate warranty claims in continental United States (48 states). Not ronsible for overseas shipping expenses.


Shipping by common carriers (truck lines) must be arranged by American Speed.


On non-warrantable or non-legitimate claims, customer is responsible for shipping expenses and any resultant parts and/or labour charges performed by American Speed.


American Speed does not warrant short blocks.


American Speed dyno tests all their engines to check and verify performance and reliability.  American Speed does not guarantee mal-performance due to vehicle, vehicle related equipment or accessories. Non dyno tested engines are not covered by this warranty.


American Speed makes no guarantees of merchantability or fitness for a particular use, or that its engines are approved for general use, or that they comply with state or municipal laws.


Due to nature and type of use of high performance engines, American Speed retains the right to determine in its sole discretion whether or not any American Speed product is covered by warranty.