The reason you cant get a straight answer is there is no such thing, there is no majic number that it can hold and it will blow a single hp later everyone has diffrent results, I would say justins motor is the example of the high end what an unopened 1uz can do, this is the result of quality fab work, maintance and tuneing,
Tuning has a magor part in it, if you talk to someone that has no concept of proper tuning they might clame the motor is junk and cant handle 300hp, but talk to someone that is a master at tuneing or payed someone that is good, and they got 500 out of it all day long.
Another thing to think about with rods, what kills rods is not how much boost or hp/tq its makeing its the rpm, the most stress on a rod is on the exhaust stroke leading into the intake, when the piston goes slack for a second the gets loaded again, this is many times the load of the fireing stroke, no matter how much power you make, but increasing the RPM increases this load expentally. If your makeing your power within or near the factory rpm there is a lot you can get out of the stock rods, now if you want to go to 9000-10,000rpm range the loads on the rods get really high really quick and aftermarket units become a must.
Im hopeing for the 450hp range with boost cams, and tuneing. witch is in line with justins current results.
and yes the crank is forged.
