Originally Posted by colwell707
So here is the story. Bought my 99 1500 4x4 5 speed with a smoked motor 5.2 magnum. Did a full rebuild. Also put in a comp cams small RV cam and heavier valve springs. Everything of inportants was replaced or gone through.
The problem I'm having is it seems slow and definately a dog between shifts. Anybody have any idea what this might be? Solid vaccum pressure. Timing is solid.
The first thing I recommend is that you do a fuel pressure test, make sure it's at 43.5 PSI, 40 MIN.
The next thing I'm going to ask is what Cam did you get, the timing might be right, but the engine might not be producing enough torque at low RPM's. Also did you make sure to match the torque converter to the cam application, on comp cams site they have a camselect thing that will give you theoretical dyno results will also give you an indication of a properly selected torque converter.
This is what I can think of for right now. I noticed the comp cams have grinds that are advanced 4 degrees if installed dot to dot where the stock cam has a grind which is retarded 3 degrees when installed dot to dot.