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What engine and how is the car used
2jz pistons are the same size as sr20 so I cant tell if you have a 4-cylinder or 6-cylinder
In general a stock sr20 can support 360rwhp to 380rwhp this is considered a minimum for me as a reliable daily driver (20 years 200,000 miles)
For 2jz-gte the minimum is simply 150% of stated or 360rwhp times 1.5 = 540rwhp
Thus your target goal is very low, and confuses me with the engine mods.
In other words, it takes NO Modifications to a stock engine besides cam/spring to make those stated numbers and ANYTHING you do or have somebody do is going to reduce the reliability of the engine.
I would be surprised if you see 10,000 miles from an engine that somebody opened up and fooled around with the bottom end / pistons/rings/etc... It generally ends poorly. Whereas if you take a perfectly stock 140,000 miles 2jz-gte and produce 550rwhp you can take that engine to 240,000 miles easily (+100,000 miles and 10 years of service) with no modifications or rebuild necessary.
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