[pgarner]

yeah but muscle cars mainly run along the lines of a simple engine in most cases a hemi. this only gives a 2 valves per cylinder so less control of air fuel mix. And as most were built like og mentioned in the 60s and 70s then the technology wouldnt have existed such as vvt, sophisticated injection or even a ecu to adjust everything for best power / economy.

remember a 1930's rolls royce was 5 ltr and only produced around 50bhp. run forward 40 years and your looking 5ltrs kicking out 300ish.