Q: I have a 1981 Pontiac Firebird with a Chevy 350 in serious need of some more low-end power! It has a Holley Dominator manifold and a 750 cfm car, 305 heads, a .480”-lift cam, Hedman Hedders into a 3” Flowmaster exhaust, a Powertrax limited-slip differential with 3.73 gears, and a TH-350 tranny with 2,200-2,500
Carb tuning has been a popular topic for us and our readers. Over the past few years, we’ve done several posts on the topic. The process itself can be a little tricky and very trying — especially for novice wrench-turners — so we thought we’d take the work out of finding good information. That’s why we’ve taken our
An improperly adjusted electric choke on a Holley four-barrel carburetor can keep your engine from idling properly during cold starts. Starting a cold engine requires a richer air/fuel mixture as cold fuel vaporizes slowly. Therefore, the choke provides a richer mixture by slightly closing off the carburetor’s air supply. When the choke isn’t properly adjusted,
This is the second in a video series that will teach you how to effectively tune your carburetor. In this 12-minute video, the tech experts at Summit Racing will provide the basics of how to make idle adjustments on your Holley-style carbs, including curb idle screw and idle mixture screw adjustments. Be sure to check
This is the first in a series of videos that will teach you how to effectively tune your carburetor. In this 15-minute video, the tech experts at Summit Racing will walk you through the process of tuning the carburetor inlet circuit on a Holley-style carb.
Holley carburetors have a power enrichment system that provides fuel to the main power circuit during heavy loads or under full throttle situations. The vacuum-operated power enrichment system is controlled by a “power valve” that times the operation to your engine’s specific needs. The power valve opens at low vacuum, such as at wide-open throttle,
[portfolio_slideshow id=10444] If you ever have the chance to discuss engine tuning troubles with the legendary Jon Kaase, you’ll rejoice in his simple logic: “Most engine troubles are centered on spark or fuel—if it has the former, it is either getting too much or too little of the latter,” Kaase says. With help from the
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