You’ve got questions. We’ve got answers — when we work with the Summit Racing tech department to help you tackle your auto-related conundrums. In this week’s Mailbag, we help a reader troubleshoot sluggish engine performance he’s experiencing when his Holley carburetor’s vacuum secondaries are activated. Q: I have a Chevy 383 stroker with a Holley 600 cfm vacuum
Iconic — adj. \ī-ˈkä-nik\ — widely recognized and well-established; acknowledged for distinctive excellence What are the most iconic brands in the automotive performance aftermarket? We thought about that for a while and collected votes from thousands of hot rodders and performance enthusiasts on Summit Racing’s Facebook and Instagram in search of the answers. The word “iconic” may mean different things to different people,
Q: I have a 355-cubic-inch small block Chevy. The carburetor is a Holley 1850, 600 cfm with manual choke and vacuum secondaries. My problem is, the secondaries won’t open at any speed or rpm. When I hit the accelerator, I actually get a bog and have to let up. I can accelerate the car fairly well
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
Maximize the capabilities of your high performance Holley carburetor by learning how to tune it for high-horsepower and racing applications. In this 38-minute video, a Summit Racing tech expert covers jet tuning and the advanced power valve on your Holley carb. This video is a gold mine for tips you need to get the most
Holley four-barrel carburetors are probably the most common high performance fuel mixing devices on the planet. Given the sheer numbers of carburetors made since the 1950s, you know they work. If there is a fly in the Holley ointment, it’s setting up the idle. Since Holleys are so easy to adjust, it’s also easy to
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,
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,
Stay Connected