*Accurate average torque readings were attained after 4,000 rpm, allowing for converter lock-up (less slippage).
Note: a gain of 134 rwhp at 6,100 rpm (not peak) was realized from the previous ported-head swap, and now the roller cam.
Indy Sr Heads Flow Chart
As tested at Ray Barton Racing Engines, SuperFlow SF-600 flowbench.
| LIFT | .200" | .300" | .400" | .500" | .600" | .700" | .800" |
| INTAKE | CFM | 150 | 215 | 266 | 308 | 335 | 357 | 374 |
| EXHAUST | CFM | 112 | 151 | 195 | 215 | 239 | 252 | 260 |
Note: To obtain similar flow and power numbers, Indy sells the SR295 CNC heads. The CNC heads will save you from many hours of porting.