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for a reliable engine at 250 horsepower use an OEM S14/S15 sr20det boost only 12psi
For a reliable engine at 200 horsepower use an OEM S13 sr20det boost only 7psi
For a reliable engine at 330~ horsepower use an OEM LSx
For a reliable engine at 480~ horsepower use an OEM 2jz-gte w/ turbo/injector upgrade
Once you pass the 550 mark your options are limited to the capacity of your wallet to find the right machine shop and buy the right parts and power of prayer.
Notice all options include OEM parts as much as possible. By using OEM parts you are rewarded with OEM service life, which is anywhere from 50k-250k miles.
Just because you use forged parts doesnt mean the engine will be more reliable. Often it becomes less reliable, and more sloppy and gives more blow-by.
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