GWC Warranty review: Car warranty

I had a misfire on cylinder 7 in my 2016 RouchSCf150 truck when I bought this truck at 90,000 miles I purchased GWC Exclusionary Coverage. On roughly Sept 18th took to dealership found the motor or long block needed replaced due to a bad piston ring that caused the motor to fail. GWC had me to tear down the motor at my cost $2600.00 so they could inspect the motor. On inspection they denied the claim stating the vehicle was Modified. This was purchased from a Ford dealership brand new in the same condition it is today nothing has been changed. When I was sold the warranty at Tropical Auto in North Palm beach Florida. I was told the Roush Package was a factory add on and yes its a Real Roush truck you can put the Vin in at Roush.com and it shows it was manufactured at that site. One this truck was was manufactured this way by Roush I have the window sticker and the Owners manual stating and speaking to the Roush mods on the truck. Second why would you sell a warranty on a truck and only when a claim is presented say its not covered. This needs to be covered the vehicle has never been modified since it was sold at a dealership brand new. Also stated in the Exclusionary warranty states same as dealer warranty this was covered by the dealer.VIN 1fTEW1EF2GFB31235