GM's STRANGEST Big Block V8s: The Crazy 455s You Didn't Know About
Did you know that some of GM’s biggest engines were also the strangest? Imagine a 455-cubic-inch V8, a true big block, but fitted with a two-barrel carburetor—hardly what you’d expect on one of the greatest GM engines! These unusual setups emerged from Oldsmobile, Buick, and Pontiac in the late ‘60s and ‘70s, creating what might be the strangest and weirdest GM engines of the muscle car era. While the 455 engines could roar with four-barrel setups, GM’s two-barrel versions aimed to blend power with fuel efficiency and low-end torque.
This quirky design worked better than you might think, thanks to the surprisingly capable Rochester 2GC carburetor. These two-barrel 455s felt lively in daily driving, despite sacrificing top-end horsepower. So, were these strange two-barrel big blocks a genius move by GM or just an odd misstep? If you’re intrigued by the weirdest and most unusual moments in GM engine history, comment your thoughts, and follow us at Muscle Car Masters for more on muscle car legends!
00:08 Introduction
01:16 The 455 Engine and GM's Strategy
03:49 Oldsmobile's Role as the Pioneer of the Two-Barrel 455 (1968)
06:03 Pontiac’s Take on the Two-Barrel 455 (1971)
08:42 Buick’s Unique and Final Use of the Two-Barrel 455 (1974)
11:21 Technical Insights on the Rochester 2GC Carburetor
13:05 Conclusion
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