stanglx347,
Thanks for the info on your mods. Maybe I should have gotten the Down box.
This Comp Cam box is one PITA. First, I had to port the inlet to 70mm. It had a very small hole. The two tb and EGR gaskets were different diameters, both too small. One gasket had to be ground as it had metal in it. Why didn't they make this thing for a 70mm inlet? The six hold down bolts were too short. I bought six more the correct length and now all six won't screw in because of alignment with the holes in my GT40 lower. Also my regulator has interference with the box. Don't know what to do there yet. I will have to drill the holes larger and see if they will screw in. Looks like to be about 1/16 to 1/8 spaced wrong. I know my intake is right because I have used a Hogan box on this same intake when it was a 302 and the bolts fit fine.
And after all this, it is probably not even the problem.
I called Comp Cams today. Their expert told me to retard it 4 degrees from where I am. That would put it at 1/2 degree retarded. It is 3 1/2 degrees advanced right now. He also told me this cam should pull to 6500 rpm with a 347 if degreed properly. He said it is not my intake or headers. He said my engine would make more hp with a better intake and larger headers but the fact that it is falling off the way it is, is an indication of degreeing and not intake or header.
Right now, I don't know what the hell to believe. I have been told fuel, timing, ignition, intake, headers, valve springs. I am not sure who knows what they are talking about.
I'm going to try the box, if I ever get it to fit properly, as I have already paid good money for it. I'm not buying anything else until I have a little more confidence of what is wrong.
This 347 has been one fustrating project from start to finish!
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