I really didn't Consider they did A great deal to the bigport and smallport? I'd a S/T 20v as soon as that hated life when it had been disconnected.. I have go through the 5500 rpm limit has one thing to perform Together with the ignitor/ ecu/ dizzy set up. https://andyfeeaz.shotblogs.com/what-does-toyota-4age-blacktop-engine-for-sale-mean-40678915