Dyno Results
With Project '67 finally running we scheduled a dyno appointment. Since our plans are to ultimately reinstall the supercharger we wanted to baseline the engine in naturally aspirated form, and get verification that the EFI system is functioning properly. We also wanted to see what our power level was now that we had installed different heads, dropped the compression ratio from 10.4:1 to about 9.2:1, and of course ditched the 750cfm double-pumper for fuel-injectors and a throttle body.

In carbureted form, naturally aspirated, the 331 motor produced 370 horsepower and 340 ft.lbs. of torque. On the Dynojet 224X at ImportsAutomotive in Concord, CA our EFI 331 produced 363 horsepower and 320 ft.lbs. of torque. We didn't lose much in terms of peak horsepower, however we dropped 15-20 ft.lbs. of torque across the board. We're sure this is a result of the drop in compression and the fact that we are running a much larger cylinder head (Dart 210cc versus the 170cc World Jr. ported.)

With the EFI system working as intended we'll next work on reinstalling the supercharger. We'll use a conventional 5.0L Mustang style mass-air meter matched to much larger injectors than the 30lbs. we're using naturally aspirated.