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rebuilt engines and forged pistons are kind of the opposite of a reliable engine.
Its more for racing and abuse.
I don't know many engines at all of any make or model with forged pistons and high mileage. There might be one on the entire forum thats gone 20,000 miles I think.
If you need a reliable engine you want a factory cast piston or a factory alloy forging. I don't think the factory ever put typical low silicone forged units into anything reliable, ever
sorry if this sounds harsh but somebody needs to. I think it's a really really dumb idea to use the KA engine when there are so many other superior performance models available.
Any other swap engine would be a better idea. Throw a rock, flip a coin, get a used OEM engine from one of the big three and keep the OEM internals and it will be reliable.
Continue with your current plans and it will start with you getting fucked by a couple machine shops and end with you wasting all your money and having nothing to show for it, and parts that nobody wants to buy. Even if you beat the odds and get it together properly and in good time, chances are you lack the patience and understanding that a loose cold forged piston requires along with the finesse of oil control system maintenance to keep it together.
I've had forged pistons in almost every kind of engine and the one thing I learned is that you don't use those in a reliable daily driver type of application unless you are masochist and money to burn.
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