I know this is going in another direction, but has anyone in here have had thier 352 heads redone. I mean hardend seat, new valves with grind, new springs, resurface after shake and bake, and new valve guides. I just got a quote for $417.00 and im sure after tax and another $50.00 bucks. I dont know but that seems alittle high.
As far as the trumpet gizzmos, early EGR sounds good, but the purpose of the EGR (exhaust gas recirculation) is to do exaclty that recirculate through the intake and into the cylinders. These things loop into themselves. I mean they could be an eraly version, but who knows. The mystery is still unsolved.......