Inline dual four Holleys

[Michael C Henry]

I intend on taking the carbs off tomorrow. I'm through manditory emissions testing. My first test failed with 279 PPM HC and 2278 PPM idle. I had is repaired which was mostly turning up idle to about 980 RPM. That backed idle numbers down to1980 PPM . I went back to testing station and they dinked around with it running and temperatures got too high. I had to bail and take it out and cool it down. Back at testing station ,cruise was 185 but idle went to 2300. Now in the office what should have a examination of documents and a printer, turned to be a ("I'm the new manager and Millisa used to take care of these , You'll have to call the office of ecology and talk to a referee.")
1 800 and push this and the that now wait and leave your number. Tom Jones from department of ecology called while I was on the way to gasoline station tget more fuel (missed call). I called him back (he was in Vancouver). He pulled my info up on his computer and waived it then and there. He told me to go back to the testing station and ask for a reprint. The manager was ready when I arrived either Tom called or she had new infomation. Now I have a waiver in hand and on file3 to get the tabs.
My liesenced emissions repairer said to swap the jets down one or two numbers. I'm going to install the vent whistles. I'll check the powervalve numbers, readjust the floats . Then I'll see where I'am and see what we can do for the idle stuff. I'm still open foradvise on what can be done to lean down the idle .

[StanJ]

Michael,

As you've discovered, the Holley 1850 600cfm 4brl isn't factory-calibrated to work efficiently in dual carb applications. Specifically, the idle circuitry is far too rich (especially on the secondary side) and the circuit timing (primarily a function of air corrector sizing) is way off. Addressing these problems is straightforward enough; pick up a pair of adjustable metering plates (not metering blocks...I realize that you don't have the room for them) which are available from us or any of several other manufacturers, and have us or another competent carburetor technician of your choosing modify your primary metering blocks to accept screw-in idle circuit feed restrictions and your carburetor main bodies to accept adjustable air correctors. This will give you the tuning latitude necessary to bring your exhaust emissions into compliance, and at the same time allow for greatly improved throttle response, power, and fuel mileage.

Stan Justus
Stallion Racing Components