Good threads...I think everyone should know that more CID is going to make more torque...and torque is what moves you!
Like the aussie head video!
My two cents
*push rod engines 2 valve engine = lower RPM...need more CID
*overhead cam hemi chamber 4 valve = higher rpms...less CID
*HP is directly related to the amount of money you want or have to spend...Ford, Chevy, Ponco, or Brigg&Straton
*no substitution for "Cubic Inches"...real or boosted CID
*as an engineer you alway try to improve on a design...not just copying or steal a designs. Now, we are talking about production engine that are driven by a cost factors, EPA rules and the corporate goals.
Bottom line on cammer vs push rod...what sound do you like! either will make enought power!
However...IMHO,
if you want a Chevy engine...get a Cheetah! Cheetah Evolution It was the Chevy's guy awnser to the Cobra.