Engine Performance: Complete Guide Part 261

If you plan on adding additional carburetion, a higher lift cam, or just want additional performance and lower end strength in your daily driver, the 261 is for you! The Chevrolet enthusiasts of that era knew about the 261 and its potential for added performance. Some of these will already have had extras added such as a higher lift cam shaft, extra carburetion, or dual exhausts. Jan 8, 2015 · Our initial viewing of Ryan MacNeil’s 261 Stovebolt engine’s first-fire video piqued our curiosity, so we reached out across the vast open spaces of the interweb to find out more about the project. Here is a compilation of 1954-1962+ 261 and 235 engine compression ratios, and ID information for 261engines (USA Chevrolet truck 261). The 1955-2nd series information is incomplete/confusing, because the 235 and 261 engines changed at some time in 1955. Block: The 261 was introduced in 1954 and was used in Chevrolets "big" trucks and school buses. They can be identified by "Captains Bars" (II) cast in the block above the starter and top center on the driver’s side of the block. Jan 1, 2023 · Frank McGurk, long a familiar name in Chevrolet circles, had just finished his semi-portable engine dynamometer and just happened to have a brand new "261" engine.