Quote:
Originally Posted by James
I've done some preliminary testing (305 head only) using putty in the intake port. Here is the charts I came up with:
First one is before intake port mod. Second one is after intake port mod.
It show a significant improvements.
My goals is to do every cylinders with the intake manifold and carburetor attached to achieve the best possible and equal flow rate between the cylinders. This will be my winter project.
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Big improvement for sure. Did you just add a "lump" in the intake floor to smooth out the corners a bit?
Good to see some actual flow numbers. Are those at 28" of water? Compared to something like a BBC head, these heads flow terrible in stock form.
I recently made a deal on a 478 that I am going to build this winter (hopefully). Plan is to offset grind the crank to get it over 500 cubic inches. It is a Magnum engine.
Can any larger valves be installed in the Magnum head? Does anyone have flow numbers on a Magnum head?