Anybody have any experience with them? I am looking at a carb rebuild for the 267 sbc in our '40 chevy p/u. It is bone stock except for weiand dual plane and block hugger headers. Currently has a 1850 on it. My thought is that the 650 is too big for the little engine anyhow while the 4412 might be a little closer to what it needs by being 500 cfm. I can use an adaptor to mate the 2 bbl to our 4 bbl manifold. Any thoughts?? thanks-
The 1850 is a 600 cfm vacuum secondary carb. So, it has only 300 cfm (roughly) on the primary side. You're going to replace it with a 500 cfm 2bbl? Sounds like you're going backward, if you're trying to improve driveability.
Dan, Actually your 4 bbl will come closer to hitting the mark then the big 2 bbl on you mostly stock mill. The 2 bbl is 500 cfm all the time and the 650 is only 650 when the secondaries come open so in theory you are running on about 300-325 CFM most of the time. being vac secondary it will only pull the secondaries open when it needs them and if you fiddle with the springs you can limit how far the secondaries come open, not enough vacuum and they only come partly open.
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