Why would you say these people are lying and how does that make them look good by saying that? I personally run a stock block, stock ford forged pistons, a ford stock crank, stock ford rods, etc. I am on my second motor now. My first motor was exactly the same and lasted 3+ years. It made close to 575 at the flywheel. After 3 years of boost the stock block cracked, but the stock factory internals were fine. If the car is properly tuned and has a complete fuel system it will withstand that kind of power for some time. The weakest link is the stock block, and that can go at any time. The internals are actually very strong.
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