Every car enthusiast wants to get more power out of their engine. In the world of muscle cars, adding headers is one of the most popular ways to do this. But what if you’re driving a 305 and you want 350 headers? The short answer is that it depends on your setup, but there are also some other considerations for installing 350 headers on a 305 engine (and vice versa). 

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What is a 305 engine?

The 305 is a small block Chevrolet V8 engine, which means it’s an overhead valve (OHV) engine with a displacement of 5.0 liters. It was manufactured from 1962 until 1995 by General Motors and has been sold in trucks, vans, cars and SUVs. 

What are 350 headers?

350 headers are an engine component that’s designed to improve exhaust flow. They’re made of metal, and they’re designed specifically for certain engines—specifically, the Chevy 350 engine. The name is actually a bit of a misnomer: you can use these headers on any Chevy V8 engine (and its variants) with a 305 or 350 cubic-inch displacement.

Will a 350 header fit on a 305?

The answer is, it depends. The exact answer depends on the exact engine you have and the headers you are trying to install. In general, 350 headers will fit on a 305 but there may be some modifications needed in order for the engine to run properly. For example, if your 350 header has an exhaust manifold that attaches directly to it then you will need an adapter in order for it to work with your 305. Or maybe your 305 came with an engine management system integrated into its stock exhaust manifold so buying a new exhaust manifold might not be possible because of this fact.

The answer is that it depends, but they can be beneficial to your engine.

Headers are not required for your engine because it’s just an exhaust pipe that brings the hot gases from where they’re burned in the cylinders over to a muffler and/or resonator, which helps quiet down the sound of those hot gases being expelled out of the tailpipe. On engines with headers, there’s no muffler or resonator so you’ll hear more noise coming from them. 

Conclusion

The final answer is that it depends. It may be possible to make 350 headers fit on a 305 with some extra effort, and it can be worth the trouble if you want to increase horsepower in your 305 engine.