Which 502 Mag ?

Reason for asking - the carbed version's have a high rise GM intake. The MPI's have fuel injection, and yes, if you convert to carb with Holley 800 or so and a good aftermarket high dual plane you will gain power. With it's dinky lame azz cam, a HR dual plane with work well.

mark 5 carbed version, embarrassed to say I have no idea what intake is on it or what cam is in it

I always enjoy seeing an engine combination, with a dyno sheet. Esp a 540 with AFR 315 heads.

If anyone is interested and can post it I can send you the dyno graph of my carbed 540 with 315 AFRs and vic Jr.

Don't forget about the tunnel ram guys. The old myths about them have been smashed time and time again and a properly tuned tunnel ram will increase the air flow of the cylinder head...

The only time I have flowed an intake and recored a increase in the flow of a cylinder head is with a realy well designed sheet metal intake, most still loose a bit. A well ported cast intake of any type or out of the box drops aiir flow through the head.

And your point is?

thats for sure,especially for larger intake vales like 2.19 or 2.25"

That an intake that can flow more wont increase air flow of a cylinder head unless the cylinder head already has the ability to flow more air.

No it does I've seen it done on a flow bench. It's been a couple years since I've seen it and honestly at that time I really wasn't interested in it @ .500+ lift the head started gaining with the tunnel ram on it not much but it started gaining. I kinda dismissed what I witnessed on my buddies bench until about a year ago. I started looking into tunnel rams. I called all kinds of cylinder head guys alot of them said yes if done right the will pick up some said no they will not. They are called a tunnel ram for a reason...