The big block Buick 7.5 engine came out during an exciting period for muscle car enthusiasts. However, power declined over the years with final 1976 ratings closer to 200hp. All these specs allowed the 7.5L big block V8 to make up to 370 horsepower and 510 lb-ft in 1970 models. The Buick 455 pistons and heads are a couple of the exceptions, though. For example, the Chevy 454 is a whopping 150 lbs heavier than the Buick engine.ĭue to the same stroke as the smaller 400 and 430 engines most parts are actually interchangeable. This made the 455 a thin-wall casting engine block that weighs a lot less than engines of similar size. Buick bored the engine to end up with the 7.5L displacement. It’s actually the same stroke as the smaller 400 and 430 cu in Buick engines. For example, compression ratio was dropped significantly in 1971 to prepare for lower octane unleaded gasoline.Īnyway, the engine offers 7.5L of displacement by ways of a 4.3125″ bore and 3.9″ stroke. A lot of the specs and horsepower ratings went thru some drastic changes due to unleaded fuel, emissions laws, and new horsepower standards. We’ll talk about certain specs more in-depth when we cover the history of the Buick 455 big block engine. What Cars Use the 455 V8?īuick 7.5 V8 engines were in the following years and models: In this guide, we discuss Buick 7.5L V8 specs, history, performance, reliability, and more. Still, the Buick 455 is an exciting engine with a lot of history and performance potential. However, changes with gas & emissions laws – as well as new standards to measure horsepower – dropped output to 205hp by 1976. The 455 cubic inch motor made 350-370 horsepower and 510 lb-ft of torque in its early days. It came at a time when big block V8’s were dominating the muscle car world.
The Buick 455 is a big block 7.5L V8 that was produced from 1970-1976.
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