The Hurst Hemi car, the Super Stock Darts and similar cars ran FULLY BLUEPRINTED RACING HEMIS!

They were VASTLY more powerful the production line street hemis. They ran 12.5:1 plus CRs, radical cams, open long tube racing headers, custom intake set-ups, worked valvetrains, etc.

Even those (and the similarly prepped 426 Hemi NASCAR racing engines) made less than 600 HP.

Here's an interview with the head of Chrysler's NASCAR effort in 1970. He clearly states what I just reiterated:

http://www.hotrod.com/web/113_0508_wing/index.html

"Q: How much reserve power was left in the 426 Hemi for future increases by the end of the 1970 NASCAR race season?

A: The way we all felt at that time was we really didn't want to do any more to increase power unless it was exceptionally safe. We were running around 585 to 595 horsepower in our race engines. Yeah, we had some 600 and 610 horsepower motors but they weren't very reliable."


Sorry, but the bone stock 426 Street Hemis just weren't all that fast by modern standards.