In the late 1950s the Holley 4000 series or “Teapot” needed a redesign. Holley came out with the 4150 series. The earliest ones I have seen are from May or June of 1956. These were the first of the modular style Holleys that we know so well. As seen, we have the basics of the modern Holley 4150 style we know and love. Primary and secondary bowls, two metering blocks, a baseplate, and accessories. Like any first issue there are a ton of small details that make these distinct compared to later...

I get a question like this fairly often: “Hey Drew, my carb is rich at idle, should I drill out the air bleeds?” My answer is almost always “absolutely not.” Maybe it’s due to many modern carbs that are available with changeable bleeds, but generally speaking unless you are really deep into fine tuning, there should be no reason to change the idle or high speed, airbleeds. I really don’t care for this new “change the airbleeds!” Fad. If the issue is strictly at idle, it can be corrected with...

260/289 vs FE setups. First a chat about the different sbf carbs: I was asked via email about the 260 and 289 3x2 carbs. Basically a guy was shopping for some and needed info to make sure he was making a wise purchase. So lets have a talk. mid 1963 is the earliest I’ve seen an over the counter 260/289 Ford 3x2. I have seen them as late as early 1967. These were very small. The 260 setup: Primary carb C4GF-9510-H List 2867 Metering block 3673 47 jet Outboard carbs C4GF-9510-J List 2868...