Stayer. Porting the cylinder head 4G69. Stage 4.

Hi friends!
In this topic I want to talk about the work with the cylinder head. Earlier, in its various topics, I mentioned that doing a big project 4G69 (N/A). The planned capacity of at least 100 HP per liter volume. I think it will be more.
To obtain such power, it is necessary to modify almost all the parts.
In this topic I will talk specifically about the cylinder head.
I had a spare cylinder head. With this head and started work.

Initially, we need to understand what we're working with. For this we need to examine the cylinder head on the flow stand.

I want to say. What 4G69 cylinder head very high-tech. It shows good results with purge flow test. Its performance is much higher than the 4G63 or 4G64.
I also did the spilling oil. It is necessary to understand the degree of compression. The volume of the chamber is 51 cm3