I have Honda 91 with D12B1 carborated. The engine was getting problem of overheating as well as lowpick and running at only 100km. Recently, i visited the lahore market for purchasing old engine. Where I got SOCH Non-VTEC ZC head and block. This ZC is 96 model, which i have replaced and the other equipments like carborator, transmission, etc remain fitted of D12. I run it on petrol at 150km/h. Its good and I think if u purchase VTEC that is much powerful. I think NON VTEC is 110 whereas VTEC 130 HP.