A 460 Flow numbers

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A 460 Flow numbers

Post  IDT-572 on December 30th 2015, 10:22 pm

Just porting no valve size increase.  I worked on picking up the middle of the flow curve as much as I could.


Ported A – 460 heads 2.300 valve.

Flowed the head unported as it came to me with a new valve job.
Porting numbers are with no chamber work.

I have only done a hand full of A heads, just wanted some feed back.
Flowed the same day on the same bench.



Unported  Intake     .100     .200     .300     .400     .500     .600     .700     .800     .900  

                                81        157      211      264      313      349      372      385      399


Ported  Intake        86.7     164.5    242.2    300      349      391      417      419      419

CFM gain             +5.7      +7.5     +31.3   +36      +36      +42     +45      +34     +20



Unported exh          63.4     118      153      200     222       250       273      290      299  308



Ported exh               95.1      140     181      211      244      273       295      311      317  318

CFM gain              +32.1     +22     +28      +11     +22     +23       +22      +21      +18   +10
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Re: A 460 Flow numbers

Post  IDT-572 on December 30th 2015, 10:34 pm

I found these numbers for out of the box 2.300


PowerPort A460 340 Cylinder Heads for Big Block Ford, Standard Bolt Pattern
Lift Value Intake Flow CFM Exhaust Flow CFM
.100" 72 68
.200" 142 121
.300" 213 164
.400" 271 202
.500" 325 235
.600" 365 262
.700" 395 284
.800" 412 300
Tests conducted at 28" of water (pressure). Bore size: 4.500"; intake valve: 2.300"
Standard bolt pattern; exhaust with 2" pipe.

From the TFS website, with the 2.300" intake valve.
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Re: A 460 Flow numbers

Post  J.Toney on December 30th 2015, 11:29 pm

We'll see what it translates to when bolted on a small-ish 528" stock block deal.
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Re: A 460 Flow numbers

Post  cool40 on December 30th 2015, 11:32 pm

That's almost exactly what my old A460's flow. Laughing they run good to 7000 on my 526.
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Re: A 460 Flow numbers

Post  FalconEh on December 30th 2015, 11:35 pm

Damn, when I make some more of that big boy money, I will be asking for some port-work Cool
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Re: A 460 Flow numbers

Post  IDT-572 on December 30th 2015, 11:38 pm

cool40 wrote:That's almost exactly what my old A460's flow. Laughing  they run good to 7000 on my 526.



Thats the reason for working on the mid numbers and keeping the runner small.

Going in a heavy truck too.
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Re: A 460 Flow numbers

Post  cool40 on December 30th 2015, 11:41 pm

IDT-572 wrote:
cool40 wrote:That's almost exactly what my old A460's flow. Laughing  they run good to 7000 on my 526.



Thats the reason for working on the mid numbers and keeping the runner small.

Going in a heavy truck too.
it should be a stump puller! Cool
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Re: A 460 Flow numbers

Post  nitrous.f on December 31st 2015, 9:50 am

hey idt-572 nice work on the heads! porting on my motorsport a460 heads as we speak to! my flow#'s out of the box were just like the #'s you got out of the newer a460 heads out the box! just would like to know just what you work on in the heads to get the #'s up! any polishing. at the end or just porting and left rough to the finish! just wondering Very Happy
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Re: A 460 Flow numbers

Post  IDT-572 on December 31st 2015, 12:56 pm

Good valve job and bowl work, didn't touch the port or the short side, other than a 60 grit tootsie to smooth the casting .
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Re: A 460 Flow numbers

Post  rmcomprandy on December 31st 2015, 5:50 pm

On the intake side ... NOT laying the short side back but, widening the crown in the floor and lowering it some on the cylinder wall side with a relatively steep short side radius will help the mid lifts and pretty much keep the velocity past the valve.
Laying the whole width of the short side back will usually increase the high lift numbers at the cost of the mid lift numbers.

Remember NOT to compare actual numbers of different flow benches but, only pay attention to the flow CURVE.

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Re: A 460 Flow numbers

Post  J.Toney on December 31st 2015, 6:18 pm

rmcomprandy wrote:On the intake side ... NOT laying the short side back but, widening the crown in the floor and lowering it some on the cylinder wall side with a relatively steep short side radius will help the mid lifts and pretty much keep the velocity past the valve.
Laying the whole width of the short side back will usually increase the high lift numbers at the cost of the mid lift numbers.

Remember NOT to compare actual numbers of different flow benches but, only pay attention to the flow CURVE.
This is what I'm hearing and starting to grasp more & more from experienced engine builders. Blake stated that was his intention from the get-go when we first spoke about doing these heads. The before and after curve tells the story.
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