I saw a 30 HP increase going from a single Holley 1050 CFM Dominator carb. on a Indy 440-3 intake to two of the same list # Holley 1050 on a Indy M.W. tunnel ram intake with no other changes
I also tested two different sets of heads on the same short block using the same intake and carb, that was with a set of Indy SR M.W. heads and a set of ported 440-1 heads that flowed right at 30 CFM more on the 440-1 heads. My old pump gas 400 stroker motor made 727 HP with the SR heads and 775 HP with the 440-1 heads with the same compression ratio, both heads had 76.0 CC combustion chambers
Their was a issue with the dyno headers on the 440-1 heads, the exhaust port on the 440-1 heads where slightly bigger on the exhaust port floor than the headers where(1/8 to 3/16 inch step into the headers ), which would make the motors start to have a slight random miss above 5200 RPM

I'm not sold on the roller making it faster justifying the cost. Just maybe a different solid when the time comes.

Let’s add some......

When I flowed one of those heads, it was with a 2.25 valve and a 4 angle seat.
It flowed 356.

With a 2.20 valve on a 3 angle seat....... would it still flow 356?

Maybe

Todd told me these heads had 2.25 valves. That must be where the confusion came in. They do have 2.20 valves.

I'm still confused... ya' don't drop a 2.20 valve on a seat cut for a 2.25 without something looking "wrong".

I'm as confused as you now. My heads have 2.200 valves.

I don’t know how there’s any confusion.

As I’ve mentioned several times in this thread....... the heads were bought as the bare heads with blank seats.
I cut one intake and one exhaust seat so I could test them before and after they were cnc ported.
I cut the intake seat to 2.25”.
I remember doing it that way....... and my notes confirm that’s what I did.

I only cut ONE intake seat(#4 or #5 cylinder).
The remaining 7 were done at another shop.
What size valves they used to determine what size to cut the seat I have no idea.
Since they appear to be seating correctly from the pics of the valves, they appear to have been cut for the valves that are in the heads.

If one were to pull the #4 and #5 intake valves out........the remnants of my 4 angle valve seat might still be there.
Of course, since it appears there has been some amount of hand blending after the cnc job, that 4th(bottom) angle I used when I flowed the heads might have also been blended away.

The main point was...... when I flowed them, it had a 2.25 valve and a 4 angle seat.
It now has a 2.20 valve and a 3 angle seat.

I’m thinking those two changes would make some kind of difference in flow.
But...... maybe not.

I have a tool for setting the seat, using the valve. I don't think that a 2.25 would even work on a seat for a 2.20, and if they were re-cut to 2.20 that would have sunk them noticeably.
I'm confused also. So one seat is cut for 2.25 and it has a 2.20 valve on it. Or one valve is 2.25?

I think that next time these get a freshen, I would determine the throat and decide at that point if the 2.20 is ok, or if it needs to go to 2.25 to get them proportionally right, and put a good valve job on them. I don't like that intake seat geometry at all. Just doesn't look touched at all.

I will make note of that. In the past with my small block builds I seen some fancy valve jobs and these look fairly basic to me as well, but the way I understand it, they don't have to be fancy to work well.

Once again....... these heads were bought as bare heads with blank uncut seats.
They are unusable as they come that way.

Someone has to cut the seats to be able to run the heads.

Only because I would have thought the seat cut by you for the 2.25 valve wouldn't have re-cut cleanly for the smaller 2.20 that the heads were finished with, unless that one seat is noticeably lower in the chamber than the others.

Hit the 45 with a stone to widen it up a bit, hit the 30 to bring the outer edge in......probably only sink it .010-.015 or so.

Must be no one believes I know what I did with that head.

i'm with Brad on this. That was my confusion as well.

You guys win.

Forget I mentioned it.

I absolutely believe what you did to that head. What I found confusing is that the heads were finished w/ the smaller valves, despite what I would have thought was obvious that a larger valve had been cut for the one test port.

Too late...

at this point, they work. They flow air and make power. They are getting bolted on this weekend, so really doesn't matter at this point. Next time they come off they get shaved again, VJ with possible larger valve and set up for a possible roller cam or springs for a new SFT cam. Its all good for now. Thanks guys for all the great info here.

Bob at MCH, thought i'd gain no more than 20 hp from 2 points comp on my -1's.
Mick

Did you try it?

What was the result?

If you mean me, no, not yet. I 've been working on other cars and the house, so the engine's on the stand still. The car 's looking a little shabby at the moment, so I'd like to spray it before I put the motor in. Besides milling the heads, i've also bought a 400 indy intake with the dom flange to keep things lower in the engine bay, so I can seal the hood.
Mick