Question about 1991 Chevrolet S-10 Blazer
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Posted on Jan 02, 2017
I'd begin with "square jetting" (same at all four corners) at about 85. Then take plug readings to see which direction you need to go from there. "off the line" performance can be changed by moving the plastic cam on the primary linkage. Once you have a good baseline for your engine (each engine will need different jets, depending upon use, engine size, gearing and what you have inside ....cam etc.) then you can make fine adjustments up or down from there. 850 is about the high limit to carb size on a stock 350 engine.. When making changes to engine, do only one thing at a time, otherwise you may make a good change and cover up the results by making a bad change somewhere else.
Posted on Sep 21, 2009
SOURCE: how to hook up vacuum
When attaching vacuum lines, you need to remember only one thing. Mark each hose when you remove it from the original carb (quadrajet?) Hoses that attach to the baseplate are at full vacuum and should be returned to a similar location or to the manifold, using a "tree". Hoses that are connected to the body of the original carb only see vacuum when the throttle is opened. Those can be attached to the fitting on the right side of the front metering block. Most Holley carbs have no provision for the valve located at the front of early Q jets (bowl purge) nor do they have any electrical connections except for the choke mechanism.
The most important vaccuum line is the one for your power brakes. Make sure that one is firmly connected either to the rear of the carb baseplate or the manifold. All other lines are nowhere as critical as that one is..
Posted on May 18, 2011
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