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| Displacement | 406.0ci | | Bore x Stroke | 4.155 x 3.750 | | Rotating assembly | Probe forged-steel crank and rods | | Pistons | Probe forged | | Compression | 11.1:1 | | Heads | Dart Pro 1 CNC, 227cc | | Chamber volume | 66cc | | Carburetor | 825-cfm Mighty Demon | | Camshaft | Comp Cams hydraulic roller | | Valve lift | 0.562/0.580 inch, intake/exhaust | | w/1.6 rockers | 0.600/0.619, intake/exhaust | | Duration at 0.050 | 248/254 degrees, intake/exhaust | | Lobe separation | 110 degrees |  Given that we were dealing...  Given that we were dealing with shaft-mount rocker arms, we hit up Powerhouse Products for the correct spring-compressing tool. It makes the job much easier.  Our 406 test bed runs Dart...  Our 406 test bed runs Dart Pro 1 CNC heads and an Edelbrock Victor Jr. port-matched manifold. A call to Fel-Pro yielded the appropriate PN1206 intake gaskets.  Dyno Chart Details | DYNO DETAILS | | HEADERS: | 131/44-inch Hedman long-tubes | | FUEL: | 91-octane unleaded | | ADVANCE: | 37 degrees | | INTAKE MANIFOLD: | Edelbrock Victor Jr.,port-matched | | CARBURETOR: | 825-cfm Mighty Demon | | JETTING: | 83 primaries/87 secondaries | | MAX TORQUE: | 529.6 lb-ft at 4,900 rpm | | MAX POWER: | 574.2 hp at 6,500 rpm | | AVERAGE TORQUE: | 476.5 lb-ft | | AVERAGE POWER: | 434.1 hp |
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