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When the screaming was over,... When the screaming was over, the all-new 340 Six Pack engine had lived up to its legacy. It delivered more power than expected and has proven itself as good as--if not better than--its predecessor, and that was a big shoe to fill. | Test - 300 rpm/second | | EngSpd | STPTrq | STPPwr | BSFC | | RPM | Clb-ft | CHp | lb/hph | | *3,000 | 341.9 | 195.3 | 0.478 | | 3,200 | 353.7 | 222.3 | 0.446 | | 3,400 | 360.0 | 233.1 | 0.460 | | 3,600 | 361.5 | 247.8 | 0.454 | | 3,800 | 366.6 | 265.3 | 0.464 | | 4,000 | 378.7 | 288.4 | 0.466 | | 4,200 | 393.7 | 314.8 | 0.448 | | 4,400 | 395.7 | 331.5 | 0.468 | | 4,600 | 392.1 | 343.4 | 0.475 | | 4,800 | 383.1 | 350.1 | 0.483 | | 5,000 | 382.3 | 364.0 | 0.479 | | *5,200 | 372.1 | 368.4 | 0.492 | | 5,400 | 358.4 | 368.5 | 0.504 | | 5,600 | 349.4 | 372.6 | 0.503 | | 5,800 | 348.2 | 384.6 | 0.483 | | 6,000 | 334.9 | 382.6 | 0.515 | | 6,200 | 313.0 | 369.5 | 0.527 | | 6,400 | 314.7 | 383.4 | 0.519 | | 6,600 | 308.1 | 387.1 | 0.509 | | 6,800 | 300.0 | 388.5 | 0.525 |
| *Range: 3,000 rpm - 5,200 rpm | | AVG: 4,100 | 373.1 | 292.9 | 0.470 |
| Our best tune was with the following jets and timing | | DS | PS | | Front | 83 | 79 | | Center | 67 | 65 | | Rear | 79 | 83 | | Power Valve: 2.5 | | Timing 35 degrees total |
 If you want to properly tune...  If you want to properly tune any engine, you need a minimum of a good air/fuel meter. We had one from F.A.S.T. that measures both exhaust pipes, and for good measure, we also used the EGT sensors mounted in each header tube.
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