Warranties and Policies
Warranty must be purchased prior to the motor leaving Thompson Motorsports. 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 the warranty must be purchased through the dealer installing the motor and must be done before the motor is installed. Warranties are non-transferable. Once ownership of the engine transfers to someone other than original purchaser, the warranty is void. Short blocks will come with an oil pump in the crate not installed when a warranty is purchased. Premium short blocks and long blocks will come with an oil pump installed.
- Manufacturing defect
- Workmanship problems
Coverage does not include
- Broken or melted pistons
- Foreign objects in engine
- Multiple bent/Broken connecting rods (hydro lock or over boost)
- Lifted heads or blown head gaskets, melted heads, Melted blocks or melted head gaskets
- Torched components of any kind
- Thrust damage to motor of any kind
- Improper spacing of the windage tray, pick up tube, oil pan or oil filter
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 at the discretion of Thompson Motorsports. All warranty claims are at the discretion of Thompson Motorsports. Engine and Engine Package are not returnable. All other product returns are subject to a 10% restocking fee for inventory items, All special order items are non refundable. Repairs made without written consent from TMS are not authorized, will not be reimbursed, and will void all warranties period.
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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 10% processing fee to return items, Shipping will not be refunded. All motor sales are final.