Holley jets too big, they helped a lot but still way to much oil

Holley jets too big, If you have an older model carb you can purchase a small, inexpensive, easy to install kit from Holley (PN - 125-500) that will also protect the power valves in case of an engine blowback thru the carb. Discover the perfect Holley jet size for your engine! Your ultimate guide to carburetor tuning with expert tips and size charts. Sep 13, 2025 · Holley 650 carb casting number 2941 list-6160-1 From what I gathered it's a factory carb for most big block mopars. Oct 20, 2010 · Holley's pull their mixture through the Jets. Is the 600 CFM too big? Maybe a little, but with vacuum secondaries its not a problem. it is running 100 psi on cold starts and is idling with 55-65 hot. May 4, 2012 · Holley generally jets a little on the rich side to avoid a lean condition, and other factors like altitude can easily make 1 or 2 jet sizes different OK. Oct 11, 2020 · Did you ever change the main jets maybe they're too big? If your carb had a 70 primary that would be a 64 secondary? I'd definitely see what size the primary's are first. This is a Holley #4778 700 CFM double pumper carburetor. Many Holley performance carbs models and list#'s now come with built in power valve "blow out" protection which eliminates this problem.


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