I have two different motors with Eddy RPM, the liitle one, 4.64 C.I. 440 block has a nearly stock set on it with a six pak and Comp Cams XE295HL cam with 10.40 to 1 comp. ratio. that motors had ran a best of 10.96 at 122. mph in my 3450 lb Duster corked up on Oregon pump gas so far with issues in the trans or torque converter
not sure which yet
the other motor, 518 C.I. low deck, has a set of Eddy RPMs CNC ported by Modern Cylinder heads with 10.29 to 1 comp ratio, six pak also with a Comp Cams custom grind solid roller cam. That motor has ran a best of 10.28 at 128.+ MPH corked up on OR pump gas so far with no trans or converter issues in the same Duster
Those heads flowed 310 CFM at .600 on a Super Flow Six Hundred flow bench at Petis Performance before I put them on the car
Do you know the old adage about cylinder head flow and HP available? I have heard that there is two HP per CFM possibiltys so the 310 CFM set should be able to produce 620 HP. My 518 C.I. motor made 718 HP, 744 Ft. Lbs torque the last time it was on a engine dyno
I wouldn't hesitate a second to build another motor using them, ported or stock