Quote:
Originally Posted by Hazieview
Ok Carb experts. I have a sb400 with a mild Cam. Currently I have a factory 600 CFM Edelbrock Carb. After reviewing the Edelbrock calibration sheet I'm thinking about increasing my metering rods to the 1458s. According to the calibration chart this should put me at a richer (%8) fuel mixture under heavy loading and still maintain an even base mixture while cruising.
I'm not worried about fuel efficiency during WOT however I would like to have decent fuel economy while cruising. The 1458 metering appear to be the option I'm looking for with out having to swap out jets. I also plan on adding heavy springs that are recommended for the vacuum I'm currently running.
Any thoughts or suggestions? Thanks guys I'm new to tuning carbs.
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IMO , a 600 CFM carb is just too small for a 400. The problem I see is even if you can get the fuel part close, it still will not move enough air for a big cube small block to get the air fuel ration correct.
Remember years ago 396 (Big Block) engines had Holley's or Q jets that were rated 750 CFM or more. Your cubic inch is already above that.
Here is a useful link.
http://www.superchevy.com/how-to/eng...-combinations/