Aluminum Heads

1. What aluminum heads (if any) are small ports like the 273/318?
None
2. Are they bare heads or complete with guides and valves?
Yes, by everyone that offers aluminum heads.
3. If complete with valves, what size are the valves?
This a variable but largely 2.02/1.60
4. Are the ready to run or if complete, should they should be gone through anyway.
It is a worthy move to double check. My last Edelbrock heads were excellent and ran them without issue after a check out.
5. If you’ve used such a head, would you recommend them for basically a stock 318 build - upgraded pistons, cam from someone such as Racer Brown (and others)
Yes and no. It’s a catch 22. While you will gain performance, for less money, you can have the OWM ahead bowl ported with some throat work. This is assuming the rest of the head is in good shape.