I've seen A LOT of posts about making HP with a 318-So why is it so ???

My biggest beef with trying to “hop up” a 318, vs just starting with something bigger is, the bang for the $$$/hp per $$$ just isn’t that good.

If you have a decent core 318 to go thru, and that’s what you want to do....... great.
Put on a 4bbl, a little cam, maybe some bowl work.....
Then whatever it makes for power..... iiwii.
But if there is a hp target or goal...... and the number in mind is over 300-325-ish....... it’s probably cheaper to start with a 360.

But...... as has been mentioned..... some people just “want” the hopped up 318....... which is fine.
Just don’t cry about the cost if you’re “trying to make some power”.