L18_B110

Thanks for the reply and yes you are 100% correct.
By I think something is not right with my 1200GX engine at the moment.When I hit 5000rpm it is fine.Go over it, and it starts to vibrate up to 6000rpm.It's redline is at 6400rpm. At the moment I am not thinking of even touching 6400.The reason I want to balance the internals is to get more reliable high revs.As it is at the moment, I don't think the vibrating is good for reliability.

My idea is actually to build a higher performer A12GX engine. I just thought of crack testing my conrods before I push it hard and one of them decide to break.
But I will first find out how much it costs.
The cam I am also going to replace with a 270. Actually I am still doing research on what precise grind to get.As I want the torque and power to rise evenly from low to high rpm and not be only at the top of the rev range. It must also give more power aswell.But I don't want a cam that gives the car a rough idle.My friend has such a cam in his opel.It will soon start to work on my nerves.Later I will fit 40 sidedraft webers.

I like to plan desently and do research before doing something.
It currently is a stock standard GX engine.
GX head, GX exhaust manifold, 256 GX cam and twin Hitachi SU's.