i'm in the middle of putting a 1.8 ztec bottom end in my mk2 xr2 and i was going to use the cvh head , but the standard piston's have a dome in the top where as ztec ones are flat .
this will lower the compresion of the engine, will it lower it to much to keep the n/a or will it be ok ???
if i need different pistons to bring the compresion back up to n/a levels where can i get them from ???
thanks