Mild home head porting advice .

There is a great sticky by 1wild&crazyguy at the front door of this forum. I did my 273 heads after reading his thread. My 340 x heads are up on deck. If the hp gain is not noticeable, if done properly it's gotta help with efficiency. I didn' notice anything in my 273. But it changed the tone of the exhaust. Lori even noticed it.