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
helo,
im just helping afren who is in need of a racing cam and inlet manifold for twin 40's weber to suit his 4G91 engine.
anyone selling the racing cam pls state details n also inlet mani for weber.
do PM me plus...