I guess I am letting out the another secret I was keeping. Another JDM trick for GA16 motor. For people who is doing JWT cams might want to upgrade valve springs. I just discovered that Nismo had valve springs available for GA16DE. Actually, they are made for "K11 March: (CG13DE) but fits perfectly on GA16DE. Nismo also have Titanium Valve retainers for same engine and I heard they are also interchangeable. I can't 100% guarantee they will fit on our GA16, but it's been done in Japan. If I was keeping my GA16 motor, I would definitely interested in doing this upgrade, but doing the SR20 swap..