318 Compression ratio

All 318 heads aren't closed chamber, just the 302, and the early early 318LA, and 273 heads.....

I never understand the "have as much money porting them as buying..." Comment, as I usually port my heads for less than 50 bucks.

If your looking for 300HP, thats pretty mild, and the closed chamber 302 head would probably be more street friendly on the low end..... Just my op onion.

A little bigger valve, a bowl clean, a port match, decent compression, and a 270 adv cam of your choice, and a 318 will make 300HP easy.