Dyno testing a stock(?) 1972 440

Pull # 3.

The change this time was to our dyno headers. These are a short tube 1-3/4 x 1-7/8 x 2" x 3" collector step header. We have a cheap set of longer tube ball connect headers that should make better power on THIS engine, but we didn't have time to make the connection to the dyno exhaust system, so we just went with what we had that worked for dyno day. Time was going to be in short supply, we were going to make seven changes, one at a time, including camshaft and cylinder heads.

RPM.................TQ................HP

2500...............427...............203
2600...............422...............209
2700...............416...............214
2800...............419...............223
2900...............419...............231
3000...............419...............239
3100...............417...............246
3200...............417...............254
3300...............414...............260
3400...............406...............263
3500...............400...............266
3600...............393...............269
3700...............386...............272
3800...............376...............272
3900...............376...............279
4000...............368...............280
4100...............365...............285
4200...............357...............285
4300...............348...............285
4400...............342...............287
4500...............328...............281
4600...............318...............278
4700...............311...............278
4800...............298...............272 +22 HP
4900...............278...............259
5000...............271...............257
5100...............263...............255
5200...............247...............244
5300...............234...............237
5400...............224...............230
5500...............213...............223

Nothing spectacular, but none the less a positive gain through the entire rpm range.