360-426 Dyno Engine
Block: 360 Magnum 4.030 Bore
Crank Assembly: Our “Hemi Sized” 426 stroker kit (11.6:1cr) with 4.180 stroke
Heads: Edelbrock Magnum our stage 3 porting, 2.08 int. vales
Intake: 340 Victor deep port matched
Rockers: Our 1.6:1 s/s rockers
Camshaft: Our hydraulic roller HER6468AL-7-3
Carb: BG 850 annular 80-88
Timing: 30º
Ignition: MSD
Over View
This was a street engine using 92 octane pump gas with cylinder pressure that was low enough that 90 octane could have been run. The goal was a very high torque, fun to drive, street car, and with over 450 lbs/ft torque at 3000R.P.M. it will be a hand full to drive on the street and a very quick accelerating. The final dyno pull, as shown here had 595 lb/ft of torque at 4900R.P.M. and 606HP at 5900RPM. This engine was over 100% volume metric efficiency from 4600RPM up, very good.
-------What This Test Shows -----
That it is possible to build a very strong street small block that will live on pump gas 92 octane and be lots of fun to drive, if you can hook it up. In a properly set up chassis, this engine has the potential of mid 10’s in a 3500 lbs. car and driver.
More torque could be developed and at a lower RPM with a smaller cam. Conversely a larger cam could be used to develop more power at a higher RPM, but this might require higher compression and a higher flowing intake manifold.
Note: I would expect a similarly equipped 340”/416” or a 360”/408” to develop the same horsepower and about 20lbs/ft/ less torque.
| Engine Speed RPM | Torque | HP | Vol Eff % |
| 3000 | 451.1 | 257.7 | 82.1 |
| 3100 | 457.5 | 270.0 | 79.8 |
| 3200 | 463.2 | 282.2 | 78.5 |
| 3300 | 466.5 | 293.1 | 77.4 |
| 3400 | 468.1 | 303.0 | 76.9 |
| 3500 | 469.8 | 313.1 | 77.3 |
| 3600 | 471.5 | 323.2 | 77.5 |
| 3700 | 477.3 | 336.2 | 77.7 |
| 3800 | 489.9 | 354.5 | 80.9 |
| 3900 | 507.1 | 376.6 | 84.3 |
| 4000 | 522.7 | 398.1 | 88.4 |
| 4100 | 537.9 | 419.9 | 91.1 |
| 4200 | 553.6 | 442.7 | 92.9 |
| 4300 | 567.2 | 464.4 | 95.5 |
| 4400 | 579.2 | 485.3 | 97.6 |
| 4500 | 584.5 | 500.8 | 99.8 |
| 4600 | 587.7 | 514.8 | 100.7 |
| 4700 | 588.3 | 526.4 | 101.2 |
| 4800 | 595.6 | 544.3 | 102.8 |
| 4900 | 595.7 | 555.8 | 104.1 |
| 5000 | 592.2 | 563.8 | 104.3 |
| 5100 | 588.9 | 571.8 | 105.5 |
| 5200 | 584.4 | 578.6 | 105.8 |
| 5300 | 575.7 | 581.0 | 105.1 |
| 5400 | 558.3 | 574.0 | 104.5 |
| 5500 | 552.2 | 578.2 | 103.7 |
| 5600 | 566.9 | 604.4 | 103.6 |
| 5700 | 558.8 | 606.4 | 103.1 |
| 5800 | 546.4 | 603.4 | 102.2 |
| 5900 | 539.9 | 606.5 | 101.5 |
| 6000 | 526.6 | 601.6 | 101.1 |
| 6100 | 520.1 | 604.1 | 100.6 |
| 6200 | 512.5 | 605.0 | 99.6 |