Mine as got to be the least powerful s/c vr on this forum but had s/c on 5yr,s been great only done the 1 r/r stealth 260bhp 229lbs torque mines supposed to have a z chip in it. but the car is so smooth right through rev range i wish they still made z s/c in the different stages, mine is also a zr1 and never had belt slippage, dont like the sound of the maf being off maybe they run better that way with the vortechs. i may go for a shrick for the torque and thats it but other wise my engine is stock it's nice to get in my vr and have no running issues. btw hope you get your motor sorted jay