Pro Comp also supplied the oil pump, 8mm plug wires, and a complete gasket set (though we installed Fel Pro 1011-2 head gaskets with ARP head studs). The 347 features flat-top pistons with valve reliefs designed for use with Trick Flow Specialties Twisted Wedge heads. Though a number of offerings are available for the 5.0L (ranging from the 170cc Twisted Wedge heads to CNC-ported R-series heads), we selected Trick Flow Twisted Wedge Track Heat 185 cylinder heads (CNC-ported). The CNC-ported heads flow just over the magic 300-cfm mark, or more than enough to tax the stock oiling system when combined with the proper intake and cam profile. Trick Flow Specialties also supplied the matching bumpstick in the form of part number TFS-51402002 cam. The hydraulic roller profile offered a 0.574/0.595 lift split, a 236/248 duration split at 0.050, and a 110-degree lobe separation angle. We finished up the test motor with an Edelbrock Performer RPM air-gap and Holley 750 HP carburetor.
The plan was to run the 347 stroker first with the stock pan and then of course with the Milodon pan and windage tray upgrade. Having first performed (and photographed) the installation on the engine stand, swapping the components on the dyno was fast and easy.
Run on the dyno with the stock oil pan full (five quarts) of 5W-30 Lucas synthetic oil, the 347 produced 475 hp at 6,600 rpm and 422 lb-ft of torque at 4,600 rpm. Back up runs at a constant water temperature revealed the power numbers were very repeatable.
Next we installed the Milodon oil pan and windage tray. Equipped with the Milodon upgrades, (keeping oil and water temps constant), the 347 produced peak numbers of 486 hp at 6,600 rpm and 426 lb-ft of torque at 4,800 rpm. The oiling system upgrades were worth as much as 12 hp and 9 lb-ft of torque!