Dave I wouldn't be concerned about flow numbers on cylinder heads yet especially if you cant get the parts. Personally I would be concerned about getting a block, have you ordered one?

No, but Bill Mitchell told me to get back with him in April as he had some blocks coming. I will be ordering within the next week or two.

Dave, This is from 2009 FHO cnc Stage V replacement with 2.30 and 1.90 valves. I was offered the same valve size option from Modern but did't choose to do that. Just a little more info for you.


FHO CNC Ported Stage V Replacement Heads. For mild to wild street strip engines.

FHO CNC Replacement Head- Notes- application Blown Pro-Street Hemi - Use 45 degree wide seats for durability.
Note - Use stock intake and exhaust port openings.

Exhaust Port with 1.90" Valve Intake Port with 2.30" Valve
Flowed at 28" without tube. Flowed at 28"
.100" 61 .100" 75
.200" 135 .200" 159
.300" 187 .300" 248
.400" 230 .400" 315
.500" 258 .500" 384
.550" 267 .550" 412
.600" 279 .600" 435
.650" 287 .650" 453
.700" 295 .700" 467
.750" 298 .750" 469
.800" 301 .800" 471

Stage V Replacement Head with FHO CNC Porting.

Tests performed on Superflow 600 with FlowCom.
4.500" Bore Plate
Combustion Chamber 168cc
Intake Volume 241cc
Exhaust Volume 118cc
Intake Valve 2.30" Ferrea Titanium Tulip 11/32" Stem
Exhaust Valve 1.90 Ferrea Inconel TF Stainless Tulip 11/32" Stem



Mark

Good to hear. Stay on top of it because this hemi stuff is top secret and badass. The problem is most of these builders think that everybody they get calls from about a hemi is a tire kicker. It's understandable because these things are way expensive. But for me this is a project that will take a couple years so I need assurance that the correct parts are picked. I've beat my brain looking at flow numbers vs valve size vs builder and on! With that being said I'm learning that all these heads are capable of making the horsepower. So what ever you can get your hands on will work. Plus just like any engine its not just one component that makes it tick.

I built a hemi dart years ago using the hooker 2-1/4 primary tube 4 inch collector original style headers. I did it the factory way. clearances shock tower, moved master cylinder on flex lines, cut down steering column outer tube, spaced K member down, elongated holes on steering box and moved it over, etc. even then i still had to have some header tubes modified to fit.

If i had to do over again I would use a motor plate, and have headers custom built. Put the motor in a place where valve covers come off, might still have to do offset master cylinder and some shock clearance work. But moving steering box and stacking k member, i wouldn't do that ever again. I built the car around the headers, next time build headers around the car.

Thanks for the wealth of info guys, much needed. I'm planning on using the TTI A body hemi header . Tubes are only 1 1/8" thou, so should be a scunch easier to fit.

Do you really mean 2 1/8 inch primary pipes?

Oops, yes 2 1/8. 1 1/8 would be kinda small.

My brand new stage 5's look like jewelry from barton. No chance a victor has the same power potential as a stage5 mullenium. That head comes stock with a 2.4 inch valve, and has the intake port to maximize it. If you want to be at a certain price point, its hard to look past the victor..... But you aint gonna out run a proper set up stage5

The Stage v replacement head has about the same flow numbers as the Victor Hemi head, but costs about $2000 more/pr. Only difference i know of between the 2 is Stage V has 168cc chamber and the Victor has 170cc.

The Stage V heads that Tim at FHO sells are not stock, he has them CNC first before selling them.
I'm not sure what they flow but I do know they will make 800 HP on a 572 C.I. 10.5 to 1 compression pump gas motor at 6500 RPM with a mild street solid roller cam with dual 4150 EFI throttle bodies

Very similar to my build. ProStreet car that I'd like to take to Drag Week. Mine is a 605, Indy Block, Indy CNC SR heads, 11:1 Pump Gas, mid size roller.

Untitled by Greg Ault, on Flickr

I purchased my Stage V heads from Scott Great guy to work with, The only reason i would think about going with FHO is if you wanted to O-ring the heads for the intake, Its a diffrent offset to make up for the gasket, So you cannot just have the Heads from Scott machined to install O-rings, If your not worried about the O-rings and you will be using a standard gasket Scott will set you up with a great set of Heads.

I was looking forward to talking to Scott about those heads as i used to be a regular customer of his 20 years ago. He doesn't answer the phone or return calls.

gsmopar curious why you chose the sr over the hipo?

Scott called tonight. Informed me there is a bigger head than the stage v replacement (not the millenium) that might be better for my combo. It has a much bigger intake valve, 2.40 vs the 2.25 in the replacement head. Also he thinks a cast iron Callies block would be a better foundation for a street/strip hemi. What do you guys think, cast iron Callies block or aluminum Bill Mitchell block would make a better street block and why?

N/A gas motor, cast iron
What blocks do the Pro Stocker run still?
They ain't aluminum as far as I know
Compact graphite iron I believe, maybe the middle word is not proper, dang my memory

Advantages of iron block: Cheaper, less hassle for daily driver, more stable for slightly more power.

Advantages of aluminum block: Repairable, better handling for daily driver, 200lbs lighter off the front of your A body.

I personally wouldn't mind giving up 15 HP or so to lose 200lbs off the nose.

I read some where that pro stockers have to run iron, because its in the rules. Read some old threads on here and some say they went from iron to aluminum and seen nothing on their time slip. So looks like the horse power penalty for aluminum is a wash with the lighter weight. Gonna research these Callies iron blocks some more. All i got so far is the Callies iron is a lot heavier than the aluminum block and about $1000 less.

Muscle Motors recommended it. They said CNC SR will make the power I want at a lower RPM.