:) I have a question for any one that can shed some light on the subject, I currently have a KE20 corolla that I used for racing through country dirt roads with friends, I have retired the car to the paddock to teach the children how to drive as the car is very easy and reliable for them to learn in, here is the question, I am building an engine and need some info, 5k engine, 4K-e, injection, Big port 3K head, BMW bolt on super charger, Silvia intercooler, will the compression be low enough and will the 3K head match up with the 5K block without much modification?