Does anyone know what size oil feed fitting i need to put in the plug on the back of the block? its the plug right behind the water pump tube...

 

m12x1.75 is the thread size in the back of the block you need this adapter

http://www.turbotechracing.com/produ...dcategory=5623

that goes into the back of the engine, than you put in you oi line, most come with 1/8npt as its a common size and widely used size, and that should work for you

 

greatly appreciated bro

 

Yes that is the fitting, there is actaully 6 "plugs" on the ecotec you could pull out and use this fitting for. 3 on the back and 3 on the front. The threads are a 12 X 1.75 TPI metric

 

yup i just placed my order for that adapter... THANKS guys