hooper's book has MV and MX as the two new zl1 detuned engine codes ready as of april 69, I ve seen on another site these two prototypes were tripowers and I would imagine the 70 LJ2 motor 11to1 solid lifter tripower all aluminum w/ 4inch stroke was made as was the LT2 both meant for vettes and supposedly never made it into the cars but may have had a few leave as crate motors, interesting more vettes didn't get these aluminum motors, I wonder if durabilitly was a big downfall?? maybe only good for about 600miles than the L78s were going to pass you by on the track...
