| Flow in Cubic Feet per Minute (CFM) | ||||||||
| Lift (in.) | CPRi | CPRx | ESi | ESx | EPRi | EPRx | EPMi | EPMx |
| 0.2 | 172 | 109 | 129 | 114 | 147 | 112 | 145 | 135 |
| 0.4 | 240 | 157 | 200 | 165 | 257 | 190 | 259 | 190 |
| 0.5 | 262 | 174 | 231 | 182 | 281 | 207 | 281 | 205 |
| 0.6 | 272 | 188 | 271 | 196 | 285 | 217 | 286 | 217 |
| 0.7 | 279 | 197 | 271 | 197 | 285 | 221 | 290 | 217 |
CPRi= C's ported by Rocket Ranch, Intake
CPRx= C's ported by Rocket Ranch, Exhaust
ES= Edelbrock [Aluminum] Stock
EPR= Edelbrock [Aluminum] Ported by Rocket Ranch, intake not polished
EPM= Edelbrock [Aluminum] Ported by Mondello's, intake polished
Observations on the Intake Port Flow Chart:
1) Valve lift beyond 0.500" gains little additonal flow [Avg. 3%; Range 1.4% to 13%].
2) Well-ported C intake outflows stock Edelbrock intake [Avg. 13%; range .03% to 33%].
3) Ported Edelbrock heads flow better than ported C's [Avg. 6%; range -15% to 7.3%].
4) Edelbrock heads ported by RR flow virtually identical to those ported by M.
Observations on the Exhaust Port Flow Chart:
1) Valve lift beyond 0.500" produces significant flow gains [Avg. 7.6%, Range 4.8% to 13%].
2) Well-ported C exhaust flows almost as well as stock Edelbrock port [95-96%].
3) Ported Edelbrock heads flow significantly better than ported C's [Avg. 15%, Range 3% to 24%].
4) Edelbrock heads ported by RR flow virtually identical to those ported by M at valve lift
above 0.400", but at 0.200" lift, M porting yields 20% better flow than R porting.
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