Some carb advice for a new guy.

[tim_mc]

Originally Posted by Steeveedee

Not sure what you mean by 3-stage metering rods. I bought an AVS2 and a calibration kit (slight surging at part throttle). The rods in the kit are small at the tip, taper, and further up have a step. I suspect that that largest diameter doesn't actually enter the jet, given the carburetor configuration? I haven't changed anything yet, as it's a real mother female dog to get up there when I'm using a cane. At least I got the carb on and the truck running.

Brings back my own experience tuning my 1905 AVS2. A nice feature of the Edelbrock is the ability to swap metering rods and/or springs in a minute, adjust the idle mixture screws (if needed) and take another test drive. My neighbors were probably wondering what the hell I was doing driving in and out of the subdivision a bunch of times when I was tuning it. I printed out the calibration chart and kept track of the combinations tried and what I'm currently using. Also, it's a MUST to limit fuel pressure to Edelbrock carbs to no more than 4-6 PSI, so I added a fuel regulator and VDO #152002 gauge. That needs to be factored in on the carb decision as well.

I've uploaded a copy of the 500CFM 1901-1904 chart for any that may be interested.