Hello everyone, the first happy year! Sorry if you do not understand something of what I say, do not speak English, and I have to use the help of a translator. I tell you, my z22se astra is already close to 200,000 kilometers, I think the chain tensioner is warning that it can start, and the water pump seal loses me in most cases. I asked in one of my trusted workshops, and the change of the water pump next to the distribution reached 550 euros. and there what I tell you, my new project is going to be the complete reconstruction of my z22se, and I need your help. I have all the pieces located, but thanks to this forum I have discovered modifications to be able to extract something more from this engine. The first thing: Talk about b207r, why that piece? What is achieved with the installation of that piece? The second: The head gasket of the z22se is 0.5, but on the spare parts page you can find up to 0.35. I have seen that you can place the cylinder head gasket of the b207r which is 0.4. What do you recommend? The third: for more than I read about the elimination of balancing axes, I do not understand the installation of the bushings, does anyone with an idea of Spanish, or someone with an explanation, help me? I feel that question, but the translations into Spanish of the forum are gross My idea is to leave pistons and cranks as standard, changing all the bearings and segments. Remove balancing shafts, replace head gasket for larger CR, enlarge and polish intake and exhaust ducts. eliminate AC, and change the intake and exhaust manifolds. The car will be used to run mainly. soon upload photos of the car, since I have not uploaded any. the project is serious, and I could use all the help possible, because this engine here in Spain is very little known, and very undervalued. If you want to contact me for anything, you can find me on facebook like Isaac Hortelano Bravo, instagram: bravo816trs, and whassap; 657750488 Thank you very much, and let this project go ahead.