Performance engines are available to buy online at SummitRacing.com, Jegs.com, SpeedwayMotors.com and CrateEngineDepot.com, as of 2015. The engine manufacturers include Edelbrock, GM, Ford, Blueprint Engines and Chevrolet.
The selection at Summit Racing includes mostly V-8 engines, but it also offers inline 4- and 6-cylinder models. Shoppers also sort by the engine material, engine balance, camshaft style and manufacturer.
Users sort through the Jegs inventory by horsepower and compression ratio or based on whether the engine's emissions are street legal. It offers 500- to 700-horsepower supercharged small-block engines.
Speedway Motors labels its engines by whether they're on sale or new. Some of the engine images have stamps that indicate the site has verified the engine’s power and torque.