Moparts Tech Archive
Small Block
SB Head Flow #'s
| Stock Edelbrock Intake | Stock Edelbrock Exhaust | Hughes Edelbrock Stage I Ported | Indy Edelbrock Relocated Pushrod "Stock" | Indy Edelbrock Relocated Pushrod Full Port & Polish | Hensley Racing | Muscle Motors Stage II Porting | ||||||||||
| LIFT | Worst INT | Best INT | Worst EXH | Best EXH | INT | EXH | INT | EXH | INT | EXH | INT | EXH | INT | EXH | ||
| .100 | 68.4 | 70.2 | 67.3 | 70.7 | 70.7 | 74.1 | 75 | 66 | 72 | 66 | N/A | N/A | - | - | ||
| .200 | 126.9 | 136.0 | 97.6 | 105.6 | 137.1 | 109.0 | 129 | 109 | 132 | 113 | N/A | N/A | 140.2 | - | ||
| .300 | 178.6 | 189.8 | 127.0 | 138.2 | 189.8 | 143.8 | 187 | 139 | 197 | 145 | N/A | N/A | 206.3 | 133.4 | ||
| .350 | 199.9 | 217.0 | 140.5 | 149.4 | 226.0 | 156.2 | N/A | N/A | - | - | ||||||
| .400 | 222.6 | 231.6 | 146.1 | 154.0 | 240.6 | 162.9 | 230 | 158 | 248 | 170 | N/A | N/A | 235.4 | 157.2 | ||
| .450 | 225.8 | 238.3 | 149.4 | 160.7 | 246.2 | 167.4 | N/A | N/A | - | - | ||||||
| .500 | 228.2 | 244.0 | 154.0 | 174.2 | 252.9 | 177.5 | 270 | 169 | 277 | 183 | N/A | N/A | 257.8 | 168.3 | ||
| .550 | 231.6 | 252.8 | 166.3 | 180.9 | 253.0 | 184.3 | N/A | N/A | - | - | ||||||
| .600 | 233.8 | 253.0 | 169.6 | 185.4 | 255.2 | 189.8 | 275 | 176 | 302 | 191 | 260 | N/A | 265.3 | 176.5 | ||
| .650 | 234.9 | 255.2 | 172.0 | 188.7 | 257.4 | 191.1 | N/A | N/A | - | - | ||||||
| .700 | ----- | ----- | ----- | ----- | ----- | ----- | 268 | 182 | 306 | 197 | N/A | N/A | 265.3 | 176.5 | ||
Hughes Stage I porting = Exhaust port volume: 80cc, Intake port volume: 174cc, All numbers measured at 28" H2O, Int Valve 2.02 Ex valve 1.60
Indy Edelbrock = Test Bore = 4.030, Test Pressure = 28" Stock Int Valve 2.055 Ex Valve 1.60 Ported Int Valve 2.080 Ex Valve 1.60
Hensley Racing = did not have complete flow numbers available, however they did caution that flow bench’s do differ and comparisons may not be accurate due to the differences between individual bench’s
Muscle Motors = Int 2.02 Exh 1.60 @28"
These are some flow #'s for the MP camando magnum heads.
These #'s were done with a 2.02 intake and 1.60 exhaust valves.Standard stock type not the high flow type.
This first set of #'s is for the heads before we went for all out high flow #'s
Intake
.200=116
.300=166
.400=213
.500=250
.600=263
.700=273
.800=280
Exhaust
.200=084
.300=115
.400=141
.500=163
.600=177
.700=187
.800=188
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These #'s are our final #'s after all the porting had been done. We lost some flow on the low end lifts and gained on the higher lifts.
.200=102
.300=150
.400=201
.500=239
.600=271
.700=291
.800=301
Exhaust
.200=094
.300=126
.400=152
.500=176
.600=187
.700=193
.800=196
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This info below provided by board member Richard
Richard
The engine I am working on is a 410, eagle rod, CP piston, 14.5 compression with W2 heads.
Flow numbers on the W-2 heads are as follows. Now, the temperature in the shop when they were flowed was 106 and the humidity was around 60%, so, the number will only go up. Machinist says they will probably be about 10 higher. Will have to wait for the weather around here to cool off so that we could get numbers at a lower temperature.
Intake Exhaust
200 167 130
300 209 166
400 248 195
500 281 209
550 295 212
600 302 215
650 306 218
700 311 220
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