Sixpack on a 318 engine ?

Dartswinger70 said

It's about power in the upper rpm range 318 wasn't designed for that. The amount of money and screwing around with a 318 to get it there doesn't add up. That's why :thumbsup:

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K, i do have a question and this is just a question not an attack.... a 318 is pistons and a crank, if you put on good heads/cam/springs that's the same as you do on any motor to spin rpm, what is holding a 318 back from high rpm compared to a 340 if cam/heads/springs are equal?