Performance670.com is a website for engine parts just for the Harbor Freight Predator 670 v-twin engine. We machine all of the parts here at our shop, they are dyno tested to provide the best possible product. The Predator 670 engine is a good economical engine that can be used in a variety of different applications from repower kits, go carts, garden tractor pulling, mower racing, mud boat engines and on and on. We have tried to describe each product as detailed as possible. If other parts are needed to make a certain part work we try to explain that in the description. If you need help or need to ask a question click on the contact page and shoot us a email and we will try to answer for you.