Stage 3 CNC Ported Heads with 2.08" Valves
| Lift |
Stock Intake CFM |
CNC'd Intake CFM |
CFM Gained |
|
Stock Exhaust CFM |
CNC'd Exhaust CFM |
CFM Gained |
| .100 |
69.5 |
71.1 |
1.6 |
|
|
76.0 |
|
| .200 |
135.6 |
146.2 |
9.6 |
|
109.0 |
118.1 |
9.1 |
| .300 |
189.9 |
214.9 |
25.9 |
|
139.2 |
155.6 |
16.4 |
| .350 |
214.0 |
240.6 |
26.6 |
|
147.6 |
165.1 |
17.5 |
| .400 |
228.9 |
262.5 |
33.6 |
|
158.6 |
173.4 |
14.8 |
| .450 |
234.7 |
276.0 |
41.3 |
|
164.6 |
181.2 |
16.6 |
| .500 |
241.4 |
286.3 |
44.9 |
|
169.9 |
189.3 |
19.4 |
| .550 |
249.7 |
297.3 |
47.8 |
|
172.1 |
196.4 |
24.3 |
| .600 |
255.9 |
293.8 |
37.9 |
|
176.1 |
197.9 |
21.8 |
| .650 |
255.9 |
295.6 |
39.7 |
|
179.9 |
198.1 |
18.2 |
| .700 |
261.3 |
297.7 |
36.4 |
|
182.3 |
200.1 |
17.8 |
| .750 |
263.2 |
299.6 |
36.4 |
|
|
|
|
Edelbrock Small Block RPM Magnum
Hughes Super Prepped w/ 2.02" Valve
| Test |
Stock Intake |
Hughes Prepped Intake |
CFM Gained |
|
Stock Exhaust |
Hughes Prepped Exhaust |
CFM Gained |
| .100 |
69.3 |
72.7 |
+3.4 |
|
|
|
|
| .200 |
125.8 |
137.9 |
+12.1 |
|
82.1 |
82.1 |
0 |
| .300 |
182.5 |
188.5 |
+6.0 |
|
133.3 |
132.2 |
-1 |
| .350 |
206.4 |
212.9 |
+6.5 |
|
152.5 |
148.3 |
-4.1 |
| .400 |
228.3 |
235.1 |
+6.8 |
|
167.3 |
165.1 |
-2.2 |
| .450 |
243.9 |
257.0 |
+13.1 |
|
176.3 |
176.3 |
0 |
| .500 |
247.2 |
262.3 |
+15.1 |
|
184.0 |
185.1 |
+1.1 |
| .550 |
255.0 |
268.7 |
+13.7 |
|
189.3 |
190.3 |
+1.0 |
| .600 |
258.3 |
270.1 |
+11.8 |
|
192.5 |
195.6 |
+.61 |
| .650 |
259.0 |
272.0 |
+13.0 |
|
194.6 |
198.8 |
+4.2 |
| .700 |
259.6 |
274.3 |
+14.7 |
|
197.7 |
201.8 |
+4.1 |
Edelbrock Small Block RPM Magnum
Hughes Fully CNC Ported w/ 2.08" VALVE
| Test |
Stock Intake |
Hughes CNC Intake |
CFM Gained |
|
Stock Exhaust |
Hughes CNC Exhaust |
CFM Gained |
| .100 |
69.3 |
75 |
+5.7 |
|
|
62 |
|
| .200 |
125.8 |
158.1 |
+32.3 |
|
82.1 |
86.0 |
+3.9 |
| .300 |
182.5 |
214.3 |
+31.8 |
|
133.3 |
140.4 |
+7.1 |
| .350 |
206.4 |
240.6 |
+34.2 |
|
152.5 |
161.6 |
+9.1 |
| .400 |
228.3 |
264.3 |
+36.0 |
|
167.3 |
181.2 |
+13.9 |
| .450 |
243.9 |
282.9 |
+39.0 |
|
176.3 |
198.9 |
+22.6 |
| .500 |
247.2 |
292.5 |
+45.3 |
|
184.0 |
210.3 |
+26.3 |
| .550 |
255.0 |
297.3 |
+42.3 |
|
189.3 |
219.5 |
+30.2 |
| .600 |
258.3 |
299.1 |
+40.8 |
|
192.5 |
226.1 |
+33.6 |
| .650 |
259.0 |
298.9 |
+39.9 |
|
194.6 |
230.4 |
+35.8 |
| .700 |
259.6 |
304.0 |
+44.4 |
|
197.7 |
233.6 |
+35.9 |
|
Lift
|
2.14" OEM Inrtake
|
CNC Stage3 Intake
|
Gain
|
|
OEM
|
CNC Stage3 Exhaust
|
Gain
|
|
.100"
|
74
|
79
|
+5
|
|
|
|
|
|
.200"
|
147
|
158
|
+11
|
|
98
|
103
|
+5
|
|
.300"
|
209
|
224
|
+15
|
|
138
|
138
|
+7
|
|
.400"
|
247
|
273
|
+26
|
|
167
|
183
|
+16
|
|
.500"
|
268
|
298
|
+30
|
|
188
|
206
|
+18
|
|
.600"
|
275
|
311
|
+36
|
|
203
|
223
|
+20 |
|
.700"
|
278
|
317
|
+39
|
|
214
|
234
|
+20
|
Vol: 230 CC 76cc
BB Edelbrock Victor Stage 3 CNC w/ 2.200" valve
440 Port Size
Port Volume: INT 313cc EXH 84cc
| Lift |
Stock Intake CFM |
CNC'd Intake CFM |
CFM Gained |
Stock Intake CFM |
CNC'd Exhaust CFM |
CFM Gained |
| .100 |
74.4 |
81.2 |
6.8 |
|
|
|
| .200 |
137.0
|
170.9 |
33.9 |
99.4 |
101.0 |
1.6 |
| .300 |
191.7 |
235.1 |
43.4 |
158.1 |
165.1 |
7.0 |
| .350 |
220.1 |
267.8 |
47.7 |
180.8 |
193.5 |
12.7 |
| .400 |
247.8 |
290.4 |
42.6 |
198.8 |
217.4 |
18.6 |
| .450 |
273.9 |
313.0 |
39.1 |
215.3 |
234.2 |
18.9 |
| .500 |
293.8 |
320.3 |
26.5 |
224.9 |
248.6 |
23.7 |
| .550 |
309.5 |
331.9 |
22.4 |
230.9 |
260.3 |
29.4 |
| .600 |
310.7 |
342.0 |
31.3 |
235.9 |
271.5 |
35.6 |
| .650 |
311.0 |
349.6 |
38.6 |
239.0 |
278.8 |
39.8 |
| .700 |
316.4 |
354.7 |
38.3 |
240.7 |
284.6 |
43.9 |
| .750 |
318.6 |
356.3 |
37.7 |
241.9 |
288.5 |
46.6 |
BB Edelbrock Victor Stage 3 CNC 2.200" Intake valve
Max Wedge Port Size
| Lift |
Stock Intake CFM |
CNC'd Intake CFM |
CFM Gained |
Stock Intake CFM |
CNC'd Exhaust CFM |
CFM Gained |
| .100 |
74.4 |
79 |
5 |
|
|
|
| .200 |
137.0
|
171 |
34 |
99.4 |
101.0 |
1.6 |
| .300 |
191.7 |
235 |
43 |
158.1 |
165.1 |
7.0 |
| .350 |
220.1 |
268 |
48 |
180.8 |
193.5 |
12.7 |
| .400 |
247.8 |
293 |
45 |
198.8 |
217.4 |
18.6 |
| .450 |
273.9 |
317 |
43 |
215.3 |
234.2 |
18.9 |
| .500 |
293.8 |
327 |
33 |
224.9 |
248.6 |
23.7 |
| .550 |
309.5 |
341 |
31 |
230.9 |
260.3 |
29.4 |
| .600 |
310.7 |
352 |
42 |
235.9 |
271.5 |
35.6 |
| .650 |
311.0 |
364 |
53 |
239.0 |
278.8 |
39.8 |
| .700 |
316.4 |
372 |
56 |
240.7 |
284.6 |
43.9 |
| .750 |
318.6 |
379 |
60 |
241.9 |
288.5 |
46.6 |
INDY EZ 440 Port Size
with Hughes Super Prep work
| Test |
Stock Indy Intake Port |
Intake Port with Super Prep |
CFM Gained |
|
Stock Indy Exhaust Port |
Exhaust Port with Super Prep |
CFM Gained |
| .100 |
70 |
71 |
+1 |
|
59 |
61 |
+2 |
| .200 |
128 |
153 |
+25 |
|
101 |
106 |
+5 |
| .300 |
188 |
209 |
+21 |
|
138 |
145 |
+7 |
| .350 |
215 |
231 |
+16 |
|
153 |
160 |
+7 |
| .400 |
236 |
258 |
+22 |
|
168 |
179 |
+11 |
| .450 |
261 |
277 |
+16 |
|
182 |
191 |
+9 |
| .500 |
276 |
293 |
+17 |
|
196 |
203 |
+7 |
| .550 |
287 |
308 |
+21 |
|
212 |
216 |
+4 |
| .600 |
294 |
319 |
+25 |
|
217 |
223 |
+6 |
| .650 |
299 |
325 |
+26 |
|
224 |
230 |
+6 |
| .700 |
303 |
329 |
+26 |
|
230 |
234 |
+6 |
| |
|
|
|
|
|
|
|
INDY EZ-295 vs. Hughes C.N.C's INDY EZ's
This chart is to show the difference in INDY EZ MaxWedge CNC vs. Hughes Max Wedge CNC on the same head.
Intake Port Volumes Exhaust Port Volumes
INDY Hughes INDY Hughes
318 298 81 79
| Test |
Indy Intake |
Hughes Intake |
Gain in CFM |
|
Indy Exhaust |
Hughes Exhaust |
Gain in CFM |
| .100" |
72 |
77 |
+5 |
|
|
|
|
| .200" |
146 |
159 |
+12 |
|
91 |
88 |
-3 |
| .300" |
215 |
231 |
+16 |
|
136 |
135 |
-1 |
| .350" |
247 |
264 |
+17 |
|
155 |
155 |
0 |
| .400" |
276 |
283 |
+7 |
|
174 |
177 |
+3 |
| .450" |
297 |
304 |
+7 |
|
191 |
197 |
+6 |
| .500" |
315 |
323 |
+8 |
|
203 |
218 |
+15 |
| .550" |
331 |
339 |
+7 |
|
218 |
230 |
+12 |
| .600" |
341 |
345 |
+4 |
|
227 |
241 |
+14 |
| .650" |
349 |
352 |
+3 |
|
235 |
248 |
+13 |
| .700" |
351 |
352 |
+1 |
|
241 |
252 |
+11 |
Stealth-ported" S/B oval track heads
'596 casting number OEM valves 1.88-1.60
|
|
OEM |
Stealth |
CFM |
|
OEM |
Stealth |
CFM |
| |
INT |
INT |
Change |
|
Exh |
Exh |
Change |
| .100" |
66 |
71 |
+5 |
|
51 |
80 |
+29 |
| .200" |
89 |
144 |
+55 |
|
103 |
124 |
+21 |
| .300" |
136 |
192 |
+56 |
|
131 |
149 |
+18 |
| .350" |
176 |
211 |
+35 |
|
136 |
156 |
+20 |
| .400" |
184 |
226 |
+42 |
|
140 |
160 |
+20 |
| .450" |
186 |
231 |
+45 |
|
142 |
168 |
+26 |
| .500" |
184 |
223 |
+39 |
|
141 |
168 |
+27 |
| .550" |
183 |
218 |
+35 |
|
142 |
168 |
+26 |
Note: These flow figures are representative of improvements
that can be made with stealth porting on LA heads.
Actual flow will vary with different casting numbers.
Magnum or "Iron Ram" style heads
The chart below is a flowchart comparing the Iron ram
head to the OEM head and the R/T head
INTAKE EXHAUST
| |
|
|
|
|
|
|
|
|
|
| Valve Lift |
Magnum OEM
|
Iron Ram |
Iron Ram |
R/T |
LA '576 |
Magnum OEM |
Iron Ram |
R/T |
LA '576 |
| |
1.920" |
1.920" |
2.02" |
2.02" |
2.02" |
1.620" |
1.620" |
1.620" |
1.60" |
| .100 |
51.2 |
68.2 |
n/a |
61.4 |
69.0 |
55.1 |
57.2 |
65.9 |
51.0 |
| .200" |
121.1 |
124.1 |
119.0 |
119.2 |
118.0 |
109.0 |
114.1 |
120.2 |
103.0 |
| .300" |
181.5 |
179.6 |
177.0 |
169.3 |
176.0 |
148.4 |
155.3 |
153.7 |
131.0 |
| .400" |
207.5 |
213.8 |
224.0 |
211.0 |
204.0 |
170.8 |
180.0 |
168.0 |
140.0 |
| .500" |
209.0 |
227.0 |
247.0 |
220.6 |
212.0 |
176.2 |
187.3 |
174.0 |
141.0 |
| .600" |
208.4 |
233.1 |
240.0 |
220.6 |
210.0 |
178.4 |
188.7 |
176.0 |
142.0 |
Magnum "Iron Ram" Super Prepped Heads
| Lift |
CFM @ 28" correction |
| .100" |
70.5 |
| .200" |
140.7 |
| .300" |
202.1 |
| .350" |
223.7 |
| .400" |
239.0 |
| .450" |
258.2 |
| .500" |
268.0 |
| .550" |
264.4 |
| .600" |
250.4 |
| .650" |
245.0 |
Magnum "Iron Ram" Fully Ported Heads
| Lift |
CFM @ 28" correction |
| .100" |
67 |
| .200" |
127 |
| .300" |
187 |
| .350" |
220 |
| .400" |
241 |
| .450" |
268 |
| .500" |
285 |
| .550" |
296 |
| .600" |
298 |
| .650" |
299 |
RHS "X" Heads
(LA & Magnum heads use the same ports)
Stock with 1.92" int and 1.60" Exhaust
| Lift |
intake |
Exhaust |
| .100" |
66 |
|
| .200" |
116 |
91 |
| .300" |
177 |
138 |
| .350" |
203 |
155 |
| .400" |
224 |
167 |
| .450" |
239 |
171 |
| .500" |
252 |
174 |
| .550" |
262 |
176 |
| .600" |
263 |
178 |
| .650" |
263 |
179 |
| .700" |
275 |
179 |
Note: These are average numbers.
Stock ports can vary by +/- 6 cfm in the same head.
RHS "X" Heads with Hughes Super Prep work
Uses 2.02" intake and stock exhasut valves
| Lift |
Stock |
Super Prepped |
CFM Change |
|
Stock |
Super Prepped |
Change |
| .100 |
66 |
74 |
+8 |
|
|
|
|
| .200 |
116 |
146 |
+40 |
|
91 |
89 |
-2 |
| .300 |
177 |
202 |
+25 |
|
138 |
139 |
+1 |
| .350 |
203 |
225 |
+22 |
|
155 |
158 |
+3 |
| .400 |
224 |
241 |
+17 |
|
167 |
173 |
+6 |
| .450 |
239 |
258 |
+19 |
|
171 |
181 |
+10 |
| .500 |
252 |
268 |
+16 |
|
174 |
187 |
+13 |
| .550 |
262 |
271 |
+9 |
|
176 |
196 |
+15 |
| |
|
|
|
|
|
|
|
Now your next question is........
What will they flow on my bench?
The answer is that we don't know. That is why we supply these charts and again, I repeat, again, all flow benches do not flow the same! Benches can show a difference of about 3to 5%.
5% at 300CFM is a difference of 15CFM. We have seen benches off 6 to 8 %.
8% at 300CFM is 24CFM. An extra 24CFM will really help a guy sell heads! How does this make you feel? I know, you feel cheated, so do we, but this is what we have to deal with in this business.
So how do you go about determining a good port? After 50 years of flowing head the industry still does not have a good answer to this. Here are some indicators to help.
1. Know this for sure. If most legitimate shops are getting 350CFM airflow out of a certain head and someone suddenly starts advertising 390CFM...... that is just what it is, advertising (or a mis-used flow bench)
2. Clue to a good port. The flow should rise very quickly. For example: Lets take a head that flows a maximum of 300CFM. The lower the lift at which that number is reached, the better the port design. If maximum flow is reached at .500" lift the head will produce a better power curve than if the valve must be opened to .700" lift or more to get the flow. A head that flows good quickly is what we call our "Fat Flow" ports.
3. If the flow continues to increase above you maximum lift the port volume is too big and the port is poorly designed and will therefore have a lower velocity and poor power output.
4. The smallest port volume with the most flow quickly reached is the best designed port.
5. The flow numbers above about 95% of your net lift do a lot more for your ego than they do for your power curve......But, they look good in ads.
6. Flow numbers by themselves are a poor way to judge a head. Important power producing features like velocity and wet flow cannto be seen in flow numbers.
7. Keep in mind that we are constantly working on head development and these numbers can change. Or, maybe we should just buy a new flow bench. It would be a lot less work, and we could sell more head, because the numbers would look bigger. We spend part of every week doing R&D on head porting and design all year long.
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