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 |
| 
