So talking to a few of my gearhead friend, they suggested looking at the IFR's. they speculated the IFR on the speedmaster block was way way too small. this is something where very minute changes effect the idle AFR in a serious swing. the Speedmaster/PCE metering block has only .0225" orifices on the emulsion tubes and the IFR. at a minimum the IFR needs to be at least .031 per the Holley and Demon documentation I have, preferably closer to .035" at .0225, that is only .0004 square inches vs .0010 square inches. that means they are only 40% of the size they need to be. no way the stock Speedmaster metering blocks will support more than a V6 at idle with stock IFR jetting they have in the blocks. Talked to the folks at Speedmaster in Cali twice, may as well call my local politician. the block itself may be usable, however the block assembly is a joke and there is no support from Speedmaster/PCE. they simply know nothing, and will not return calls
Drilled out the main body LSAB's and HSAB's and threaded for #10-32 standard air bleed jets. however local speed shop did not have any stock on the emulsion jets or air bleeds, so off to the hardware store in the AM to buy some screws to modify. will most likely get brass set screws and drill with the pin-vise in the AM
will attempt to drill out the Speedmaster jets and see where that goes, Will also pick up a few #6-32 screws. going to mimic the Race Demon setup for an 850 on the IFR and emulsion tube jets. however if that doesnt work, I already found a replacement stock 950HP rear metering block
Will report back when I get the carb back together. the new main body gaskets finally showed up.
