Quote: wow, lots of replies!!! Just cool to get an idea of whats possible. it seems 6500-7k is NOT the absolute limit, which is pretty cool.
Make sure the oiling and the valvetrain keep up, sort out all the factory tolerances (BALANCE!) and really, whats the limit? Its a short stroke/long rod engine thats legendary for its fortitude. You can buy enough head these days to wing that sucker past 10K i'm sure, its really the HP limit on the block thatll keep the spin lower. Hard to get way up there without making some serious HP.
Think ov it this way... block integrity aside, its no different than a 426 Hemi, internally. Just adding the Hemi head/stuff suddenly these are easy 8K+ engines.
