This is the intake side and valve springs of the heads
| Stock | Ported(Bowl Job) | Increase | ||||
| Valve lift | Intake | Exhaust | Intake | Exhaust | Intake(%) | Exhaust(%) |
| .100 | 56 | 50 | 56 | 50 | 0(0) | 0(0) |
| .200 | 115 | 91 | 117 | 96 | 2(1.7) | 5(5.9) |
| .300 | 161 | 121 | 164 | 130 | 3(1.9) | 9(7.4) |
| .400 | 188 | 141 | 199 | 148 | 11(5.9) | 7(5.0) |
| .500 | 203 | 150 | 220 | 161 | 17(8.4) | 11(7.3) |
| .600 | 192 | 151 | 228 | 170 | 36(18.8) | 19(12.6) |
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