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Most will agree that 550-600 or so is about it, and even at 600 you will be running in the riskier zone when dependability is the concern. That said quite a few guys have engines running 650-700 with no reported problems. A lot will depend on how good the block is that you start with, and how well it's machined and put together.

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cool, thanks....that's probably about right at the limit of what I'm wanting to do. Like I said, with the car, Im wanting to build a street legal drag car, to drive around town once in a while....Ever since I was a kid, I had always been infatuated with the KOS cars, especially the few small block ones. Not wanting to go quite that serious, but you get the point. Hell, I don';t know, I may end up realizing that I want to build something a little milder to enjoy on the streets a little more. Thanks for the input, it's much appreciated.