[Smokin427]

Does anyone have experience using the Dove 9424B High Riser Tunnel Wedge Dual Quad Large Plenum Intake ? It has the raised port floors and I raised my iron intake ports to match (about 1/2"). Heads now flow a lot better (315 at .600). I also have 2" high square hole spacers under my 750 Double Pumper Pro Form carbs. Engine is just rebuilt and runs beautifully except for one problem. It just does not make the power it should between 3000 to 6000 rpm. It runs smoothly, has great AFR readings (not lean or too rich) but just does not pull hard like it should. I am suspect of possible loss of signal due to the large plenum plus the added effective plenum of the 2" spacers but want to know if anyone else has had this type problem. Just for info it is 427 with 10.5 to 1. Cam is flat tappet 254,254 on a 108 with .625 net lift. I need the 2" spacers to have the front carb bowl clear the distributor in my setup.