i have this b20vtec engine i want to buy a skunk2 intake for, but i dont know for sure if the head is a b17a or b18c head and I know that they have different bolt patterns? I dont wanna end up ordering an intake that dont fit.

Now my question is, how to know for sure if my head is a b18c or b17a head? I can take pics if you need... engine still in the car though

 

look on the front of the cylinder head slightly to the right of the exhaust manifold. if you find "PR-3" then you have a B17 head. If you find "P72" then its a B18C head.

 

one the b17/b16/itr heads say pr3 an the b18c1 say p72. and a easy way it to look at the manifold and see if you have the snail one...if you do its a b18c1 if you dont the its more than likely the b17