To my understanding the na motor dose not need titanium rods to forged pistions. with the compression ratio at 10.5 to 1 it sounds unusually high for stock. I just did come thinking and i have decided to buy a long block from stillen. I have also bought some used heads and was thinking about getting them ported. I have no idea if this is a good idea but i would think there is some horse power to be gotten for here. I know i want to get a hermonic balancer, headers light fly wheel and smaller pullys. if you have any thoughts on what i should do to get some hp with out going tt. I want to try to get 350hp na is this posable. please let me know. oh and one more thing how much time am i looking at on pulling the motor on a 90 300zx na. thank lots.........................