I contracted with Jasper Engines to build a competition engine for a show truck. I requested and was promised information about this engine. Even after many phone calls and Voice mail messages this information was never provided. They quit corresponding with me as soon as they got my money. The engine was defective and has broken down twice in less than 1, 000 miles.Costing me thousands of dollars for repairs. Jasper refuses to return any phone calls or e-mails that I sent them asking for information or concerning Warranty reimbersment concerning their faulty product. read full review »