There are some things that need considered, shared or not between the 3. Chamber alignment/size vs bore.
The lighter floating rod, then its limitations..but they always go to the late 'heavier' rod.
But mostly, people confuse goals and expectations with stock 1.78 head builds. Low expectation from titles like "lowly 318 build", "broke *** build"... it's a setup for the illusion that the 318 is some secret power house motor.
It's like most motors of small cid...nothin wrong with them. They just get passed for bigger, stronger designed blocks that cost the same in some marketplaces.
318 wont handle the same rpm and power a 340/360 will and it's due to the main saddles and shorter less beefy caps.
What's the max power handling difference between them...
Could be 100/2000 rpm ..
could be beans and cornbread with some tabasco
Let's hear some 273 guys argue with the 318ers while we're here haha