Are 310 cc heads good for a 502 or a 540? To small or good size?

Good for NA 500ci, not sure for 540ci

Who's head? A ****ty 310cc port may be worse than a 265 oval

yep, depends on the head, too small for a 540 to make high HP, but will keep the TQ there....

I'd be more concerned about the head/port design, than the particular port size of the intake. Just because a head "pours" out at a certain CC, has nothing to do with how it flows. GM iron heads were what like 320ish cc, and didn't flow anywhere near as good as say a 308cc dart, or 315 AFR. And just because a port is small, doesnt mean it will have great velocity, and just because a port is big, doesn't mean it wont have great velocity.

For example. A 315cc edelbrock, or 320ish cc GM/Merc head, will get its azz handed to it, across the board power wise, by say a 305 AFR/310 dart, or a 325 AFR/dart, on a 502-540.

Heres a good comparision article of various heads, on the same engines. The big CC ports, didn't give up as much low end as one would have thought (if any), and the small ports, didnt give up as much top end, as one would have thought (if any)

If you mentioned a 355/360 cc on a 496ci engine around here, you would probably get slapped right thru your computer screen , and get told what a soggy, three legged dog you would have for an engine, that probably wouldnt even get on plane.

http://www.superchevy.com/how-to/pro...ut-the-o-vs-r/

320 Pro Comps seemed to work well.... lol

maybe

Need to know what rpm the motor will spin. A 310 cc port isn't going to work on an 8,000 rpm 454...

Well, I'm gonna go out on a limb here, since not too many '310's' have been out there....so, are we talking Canfield's ?