Warranties and Policies
To obtain a warranty you must submit a one-time payment of $199 for all wet sump engines and $399 for dry sump engines. Blocks with a standard deck height using a 4.125” stroke will not be covered under a warranty. This is because we have found that long stroke cranks develop an oscillation at higher RPMs that tend to take out the main bearings. The warranty will cover the engine for one year and unlimited miles. The warranty does not include shipping, removal, or installation - no exceptions.
If the engine is purchased from a dealer who did not purchase a warranty, the customer has 5 business days to call Thompson Motorsports to purchase a warranty after they have purchased from a Thompson Motorsports dealer. This is only for engines that have not been installed. Warranties are non-transferable. Once ownership of the engine transfers to someone other than original buyer, the warranty is voided. Short blocks will come with an oil pump in the crate not installed. Long blocks will come with an oil pump installed.
- Manufacturing defect
- Workmanship problems
- Broken crankshaft, broken rods, or spun bearings
Coverage does not include
- Broken or melted pistons
- Foreign objects in engine
- Multiple bent rods (hydro lock or over boost)
- Lifted heads or blown head gaskets
- Torched components
We strive to send the best products available at all times, however if you should discover a problem with a product you have received, please bring it to our attention within 5 days of receiving the product. At that time, we will work to get the product replaced in a timely manner. We will not ship you any new products until the original has been returned to Thompson Motorsports for inspection. You must have written permission from TMS for any returns. Any damaged or defective products will be replaced. Engine and Engine Package returns will be subject to a 25% restocking fee. All other product returns are subject to a 10% restocking fee. If a there is a problem with a TMS motor you must bring it to our attention within 7 days of receiving the product. Repairs made without written consent from TMS are not authorized, will not be reimbursed, and will void all warranties written and implied.
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All payments on motor builds and special order parts are final and no refunds will be processed. For stocking items there is a 25% processing fee to return items, Shipping will not be refunded.