Quote:
Originally Posted by 1_2Many
Not sure about modern HEMI engines, but back in the 60's the 425 hp rated motors were making upward of 600 hp on a dyno.
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you are right but the new hemis cannot be tuned the way the old ones were...you have to stroke these ...the 425 hp to 600 one you speak of is the old school 426 hemi engine...which was a 7L v8 which was quoted wayyyyyyyyyyy below its hp rating....that is why the new hemis can be stroked into a 392 or 426....or even a 440