i have a 1994 300zx tt motor with new valves, 5 angle valve job, je forged pistons with a .20 overbore machined and balanced all this was done at 70k miles. 4k miles later I spun a rod bearing this fall and the motor was pulled. I always ran mobile one synthetic oil.
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1994 twin turbo built long block cheap - ml430v815:52:02 04/11/07