My friend came to me the other day. He gave me a MFI head and said it was a rs turbo head. How can I tell if the head is a turbo or XR3I head? The head was included cam and everything, just to fit. But I want to be shure what it is.

BR Butchi

 

the exhaust ports are round on a turbo and more square on a 3i

 

will work fine tho,not ideal