In order to put a Vtec head on a B20 block, you must tap and plug the oil hole in the head. This is because there isnt a hole in the B20 block to supply oil to the head for the vtec solenoid, like there is on a vtec block. This hole must be plugged, otherwise it will leak.
You also need to drill out the holes in the head so you can relocate the dowel pin. By doing this, you are able to use a stock B20 head gasket without having to modify it.
To supply oil to the vtec solenoid, you need to remove the 3/8" plug from the intake side of the head.
Shown above are the 2 adapters that i chose to use for my setup. On the left is a 3/8"bspt to 3/8"npt adapter. It is very important that you have this, because the head is designed to accept a 3/8"bspt thread where you remove the plug. This will give you the best seal, and help minimize oil leaks. On the right is a 3/8"npt to -4an adapter.
Installing the 3/8"bspt to 3/8"npt adapter.
Next installing the 3/8"npt to -4an adapter.
Shown here is a special adapter that i ordered from z10 engineering. It threads into a the oil pump where a plug usually is, and adapts to accept a 1/8"npt.
A shot of the adapter screwed into place.
This shot shows how close it is to the alternator. This requires you to run a 90 degree elbow coming out of the adapter off of the oil pump.
Here is the line that i prepared to supply oil from the back of the oil pump up to the back of the head. It is important that this line be atleast 18" in length. Both ends have a -4an fitting. I am also running an EARL'S inline oil filter. This is important because I am taking oil off of the back of the oil pump, which is an unfiltered source of oil.
Here is a shot of the oil line all finished and installed. On the bottom left, coming out of the oil pump you can see that I used a 90 degree elbow coming right out of it, so it would clear the alternator.
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