AFR 245 CNC Heads 2.125/1.600 Valves 763 HP

[maxracesoftware]

AFR 245 CNC Heads 2.125/1.600 Valves
CNC'd supposedly by Wilson Manifolds ?

[maxracesoftware]

429.8 cid
Peak TQ = 575.3 @ 6400 RPM
Peak HP = 762.8 @ 8000 RPM

AFR 245 CNC Heads 2.125/1.600 Valves
CNC'd supposedly by Wilson Manifolds ?

October_24_2015 Andre Miller SBC 4.135x4.000= 429.8 cid
AFR 245 CNC Heads 2.125/1.600 Valves
Chris new ProSystems 1493 CFM
Chris 2-Step Headers 2.000/2.125 31.5 long 4.000x13 inches long
11.7:1 CR Q-16 Race Gas .716 SPG
Cam Motion Solid Roller 280.3/300.6 115.1 Centers 111.0 CL
.46071/.47921 1.60/1.60 Crower Stainless Shaf .550 Offset
.180 Lifters offset Isky .015/.015 Hot Lash
Billet Fab oil pan 2 inch kickout
Moroso 3-vane Vac Pump
LAT 5/30 Breakin oil
Jesel Belt Drive
36.5 BTDC
===============================================
38.5 from 36.5 btdc
260 RPM = 172 cranking Psi Meaux's Gauge
265 RPM= 160 cranking Psi Chris Gauge
140 rear jets from .134
40.0 btdc from 38.5

setup for ProCharger Blower later on in Car

[maxracesoftware]

AFR 245 CNC Heads 2.125/1.600 Valves

[maxracesoftware]

AFR 245 CNC Heads 2.125/1.600 Valves

[maxracesoftware]

AFR 245 CNC Heads 2.125/1.600 Valves

[mag2555]

What do you suppose the fps was that the Intake tract was averaging, and what might the minimum Intake port area have been?

[maxracesoftware]

What do you suppose the fps was that the Intake tract was averaging, and what might the minimum Intake port area have been?

AFR 227CC CNC'd out-of-box-shape Port Specs :
Intake Port CenterLine Length = 5.488

AFR 220cc
Intake Port CenterLine Length = 5.494

Dart Pro 1 Ported to 245 CC
Intake Port CenterLine Length = 5.625

lets say the AFR 245CC Intake Port = 5.500" CenterLine Length
around Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 279.88
Average CSA = 2.7183 sq.inches area

if it were a Dart Pro 1 Port shape at 245 CC's
Intake Port CenterLine Length = 5.625
same Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 286.24
Average CSA = 2.6579 sq.inches area
... the Dart Pro 1 would be flowing the same CFM air
thru a smaller Average CSA

* actual Dart Pro 1 :
285.0 FPS = 2.65263 CSA 244.5CC 315.0000 CFM
Intake Port Flow at 0.866000 Valve Lift

AFR 245 CC CNC'd actual Pitot Probe data :
180deg Pitot Probe : all measured at 0.600" Valve Lift
268.9 FPS in Center of Port directly above Floor's Apex
327.0 FPS at smallest CSA in Port ( smallest CSA = 2.3266 sq.inch area... at the Port's CenterLine Length )
441.6 FPS on Floor's Apex Peak just before Short Turn Curve

[cab0154]

interesting. that is how much my profilers flowed, and I was worried about it not being enough flow to make 700. so much for that concern, nice work!

[408 Nova]

Man, AFR heads are junk, lol.

Have any numbers on the 220 cc competition ports versions?

[MELWAY]

What do you suppose the fps was that the Intake tract was averaging, and what might the minimum Intake port area have been?

AFR 227CC CNC'd out-of-box-shape Port Specs :
Intake Port CenterLine Length = 5.488

AFR 220cc
Intake Port CenterLine Length = 5.494

Dart Pro 1 Ported to 245 CC
Intake Port CenterLine Length = 5.625

lets say the AFR 245CC Intake Port = 5.500" CenterLine Length
around Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 279.88
Average CSA = 2.7183 sq.inches area

if it were a Dart Pro 1 Port shape at 245 CC's
Intake Port CenterLine Length = 5.625
same Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 286.24
Average CSA = 2.6579 sq.inches area
... the Dart Pro 1 would be flowing the same CFM air
thru a smaller Average CSA

* actual Dart Pro 1 :
285.0 FPS = 2.65263 CSA 244.5CC 315.0000 CFM
Intake Port Flow at 0.866000 Valve Lift

AFR 245 CC CNC'd actual Pitot Probe data :
180deg Pitot Probe : all measured at 0.600" Valve Lift
268.9 FPS in Center of Port directly above Floor's Apex
327.0 FPS at smallest CSA in Port ( smallest CSA = 2.3266 sq.inch area... at the Port's CenterLine Length )
441.6 FPS on Floor's Apex Peak just before Short Turn Curve

Awesome info Larry
Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST
I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp.
But none of them have shown any good track results they all
Seem to lack acceleration on race track showing 70-100hp lose on 1/4 mile
I have built many 406 engines with AFR 227 heads and they show the same power on track as dyno. On on a street race I have seen them run side by side with 434” with AFR 245 heads

[Fatman]

Awesome info Larry
Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST
I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp.
But none of them have shown any good track results they all
Seem to lack acceleration on race track showing 70-100hp lose on 1/4 mile
I have built many 406 engines with AFR 227 heads and they show the same power on track as dyno. On on a street race I have seen them run side by side with 434” with AFR 245 heads

Are your 227 headed motors showing less power than the 245 headed builds but running just as fast?

[MELWAY]

Awesome info Larry
Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST
I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp.
But none of them have shown any good track results they all
Seem to lack acceleration on race track showing 70-100hp lose on 1/4 mile
I have built many 406 engines with AFR 227 heads and they show the same power on track as dyno. On on a street race I have seen them run side by side with 434” with AFR 245 heads

Are your 227 headed motors showing less power than the 245 headed builds but running just as fast?

Yes the 406 with 227 make about 640-660hp and run same Ets on track in similar size weight cars

[Fatman]

Awesome info Larry
Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST
I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp.
But none of them have shown any good track results they all
Seem to lack acceleration on race track showing 70-100hp lose on 1/4 mile
I have built many 406 engines with AFR 227 heads and they show the same power on track as dyno. On on a street race I have seen them run side by side with 434” with AFR 245 heads

Are your 227 headed motors showing less power than the 245 headed builds but running just as fast?

Yes the 406 with 227 make about 640-660hp and run same Ets on track in similar size weight cars

Have you tried to figure out why? What kind of dyno do you have? Are the 245 headed cars are optimised with regards to suspension, converters, and gearing etc.

[maxracesoftware]

What do you suppose the fps was that the Intake tract was averaging, and what might the minimum Intake port area have been?

AFR 227CC CNC'd out-of-box-shape Port Specs :
Intake Port CenterLine Length = 5.488

AFR 220cc
Intake Port CenterLine Length = 5.494

Dart Pro 1 Ported to 245 CC
Intake Port CenterLine Length = 5.625

lets say the AFR 245CC Intake Port = 5.500" CenterLine Length
around Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 279.88
Average CSA = 2.7183 sq.inches area

if it were a Dart Pro 1 Port shape at 245 CC's
Intake Port CenterLine Length = 5.625
same Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 286.24
Average CSA = 2.6579 sq.inches area
... the Dart Pro 1 would be flowing the same CFM air
thru a smaller Average CSA

* actual Dart Pro 1 :
285.0 FPS = 2.65263 CSA 244.5CC 315.0000 CFM
Intake Port Flow at 0.866000 Valve Lift

AFR 245 CC CNC'd actual Pitot Probe data :
180deg Pitot Probe : all measured at 0.600" Valve Lift
268.9 FPS in Center of Port directly above Floor's Apex
327.0 FPS at smallest CSA in Port ( smallest CSA = 2.3266 sq.inch area... at the Port's CenterLine Length )
441.6 FPS on Floor's Apex Peak just before Short Turn Curve

Awesome info Larry
Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST
I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp.
But none of them have shown any good track results they all
Seem to lack acceleration on race track showing 70-100hp lose on 1/4 mile
I have built many 406 engines with AFR 227 heads and they show the same power on track as dyno. On on a street race I have seen them run side by side with 434” with AFR 245 heads

most of time ...even if Intake Port FPS is too high , it will just show less overall Peak HP, and way more HP loss above Peak HP RPM point on the Dyno,
and run down the Dragstrip ET/MPH just as the Dyno HP Curve predicts .
However , just one time i've seen a SS Chrysler 360 make decent HP Curve on my Dyno ,
but run down the Dragstrip 1.5 to 2 tenths and 2-3 MPH slower than predicted ,
but that 1 Engine , we could never make it run as lean as the Record setting Engine
...it just did not accelerate like it should at the Dragstrip .

let me back-track a little bit , i said Engine ,
well it was exactly the same Record setting engine , except it had a new pair of identical Heads on it was the only difference .
... so we compared a Record setting Car and Engine -vs- different pair of same castings
we spent a bunch of time on the Dyno trying to make the Cylinder Heads work ... they were down -20 HP
but they ran down the Dragstrip like they were down around -50+ HP

so i've seen a little bit of what you are describing
... this was a Legal 162.0 CC Int Port 1.880/1.600 valves ... but running as Rich as it wanted , the extra Fuel was choking the Port .
This is a 3-Speed Automatic Car , so the RPM/SEC Rate down the Dragstrip is much faster than a 2-Speed
so the 3-Speed compounds the choke problem ,,, if it were a 4-Speed Manual Trans , it would have been worse

on the best 360cid (371cid Legal NHRA ) the Plugs color like Methanol plugs, basically not much color
VP-C12 Race Gas, Thermo-Quad , 9.459:1 CR , 561.0 Peak HP @7000-7100 RPM
ran 9.67 ET best @ 2790 Lbs , would run 9.70's - 9.80's all the time in July / August heat with the good Heads !

[digger]

What do you suppose the fps was that the Intake tract was averaging, and what might the minimum Intake port area have been?

AFR 227CC CNC'd out-of-box-shape Port Specs :
Intake Port CenterLine Length = 5.488

AFR 220cc
Intake Port CenterLine Length = 5.494

Dart Pro 1 Ported to 245 CC
Intake Port CenterLine Length = 5.625

lets say the AFR 245CC Intake Port = 5.500" CenterLine Length
around Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 279.88
Average CSA = 2.7183 sq.inches area

if it were a Dart Pro 1 Port shape at 245 CC's
Intake Port CenterLine Length = 5.625
same Cam's max Lift of 0.737" CFM = 317.0
then Average CSA FPS = 286.24
Average CSA = 2.6579 sq.inches area
... the Dart Pro 1 would be flowing the same CFM air
thru a smaller Average CSA

* actual Dart Pro 1 :
285.0 FPS = 2.65263 CSA 244.5CC 315.0000 CFM
Intake Port Flow at 0.866000 Valve Lift

AFR 245 CC CNC'd actual Pitot Probe data :
180deg Pitot Probe : all measured at 0.600" Valve Lift
268.9 FPS in Center of Port directly above Floor's Apex
327.0 FPS at smallest CSA in Port ( smallest CSA = 2.3266 sq.inch area... at the Port's CenterLine Length )
441.6 FPS on Floor's Apex Peak just before Short Turn Curve

Larry,

Do you have any min CSA, Port entry CSA? For any of those heads?

Similar for the manifold what is the runner length and entry and exit CSA?