i´m not so good at wrightin english, so i hope you understand.. here goes.

It´s not right that you can´t tune at DOHC engine. infact you can youse the std pistons up till 200bhp when it´s NA tuning we are talking about. you need

komp raised up till 11:1

300 degrees cams and mekanikle valve lifters.

trottelbodyes

full programmelble ECU.

and a tubemanifold( i have an janspeed on my sierra GT from 92)

all af these things shoud give abaut 200 bhp and a big amount af tourqe.

i´m trying to bild a 160 bhp engine right now. with std ECU there are chipped.

but hope you understand. but you can get i in an danish version if you want