"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."
"Mr Norm" most certainly wasn't building 820 HP street hemis back then!
None of these 500 cubic inch Hemis packed full of modern high performance parts could touch 820 HP:
