Spark Plug for 4AGE BT 20v engine is IK20.
For further information, u may refer this website
http://www.globaldenso.com/en/products/aftermarket/plug/basic_knowledge/heatrange/index.html
Anyone can spare some tips or advice on how to make the engine run at optimum performance? I just overhauled the whole engine recently, and am trying to know what simple mods are the best for this engine. Mated to a...