99% of problems can be easily solved without returning the entire order. Orders must be sent back 100% complete and all parts brand new, never installed, in the original packaging.
Once items have been installed or used in any way they are not eligible for return. This product is NOT DIY. Over 99% of people in the world are not qualified to build an engine, and it is the responsibility of the person doing the work to make sure the parts are correct and installed correctly. We ALWAYS STRONGLY recommend parts be installed by a qualified, experienced mechanic.