Will 243 Heads Fit 5.3

The 5.3 liter engine in a GMC Sierra 1500 has a cylinder bore of 3.78 inches and a stroke of 3.62 inches. The 243 heads have an intake port size of 2.02/1.60 inches and exhaust port size of 1.55/1.60 inches. Based on these numbers, the 243 heads will not fit the 5.3 liter engine without modification to either the heads or the engine block.

If you’re looking to upgrade the heads on your 5.3 engine, you may be wondering if 243 heads will fit. The answer is yes! 243 heads are a great option for increasing airflow and improving performance.

Keep in mind, however, that you may need to make some modifications to your engine bay to accommodate the larger heads. But overall, 243 heads are a great choice for upgrading your 5.3 engine!


Will 243 Heads Fit 5.3

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What Do 243 Heads Fit?

243 heads fit a wide variety of vehicles, including many American and import cars. The most common applications are for V8 engines, but there are also many 6-cylinder and 4-cylinder applications. 243 heads are available in a wide variety of sizes and configurations to suit your specific needs.

Are All Ls Heads Interchangeable?

No, all LS heads are not interchangeable. The main reason for this is that the LS family of engines has several different head bolt patterns. There are also slight differences in the way the heads mount to the block.

These differences mean that you can’t just swap out one LS head for another without doing some modifications first.

What’S Better 243 Or 799 Heads?

There are a few things to consider when trying to decide which heads are best for your application. The first is what kind of performance you’re looking for. If you’re just looking for a mild upgrade from stock, then 243 heads may be a good option.

However, if you’re looking for serious performance gains, then 799 heads are the way to go. The next thing to consider is what kind of budget you have to work with. 243 heads can be had for a relatively reasonable price, whereas 799 heads will cost significantly more.

So, if money is tight, then 243 heads may be the better option. But if money isn’t an issue, then go with the 799s. Finally, it’s worth considering what other modifications you’ve made (or plan to make) to your engine.

If you have other bolt-on mods like camshafts and intake manifolds, then the extra airflow that 799 heads provide will be beneficial. However, if your engine is mostly stock, then243 heads may suffice. So which one should you choose?

It really depends on your specific situation and needs.

What Heads are Better 706 Or 243?

There is no definitive answer to this question as it depends on a number of factors, such as what type of shooting you will be doing and what kind of bullet you will be using. However, here is a brief overview of the two types of heads to help you make a decision: The 706 head is a good choice for long-range shooting and can handle bullets up to 220 grains.

It is also more aerodynamic than the 243 head, which makes it ideal for longer shots where wind resistance is a factor. The 243 head, on the other hand, is better suited for shorter range shooting and can accommodate lighter bullets (up to 90 grains). It is also less affected by crosswinds, making it a good choice for shooters who are dealing with gusty conditions.

Ultimately, the best head for you depends on your individual needs and preferences. If you do a lot of long-range shooting or plan on using heavy bullets, then the 706 head would be a good choice. If you need something that performs well in crosswinds or are mainly interested in short-range shooting, then the 243 head would be a better option.


If you’re considering upgrading your Chevy Silverado’s engine, you might be wondering if 243 heads will fit a 5.3. The answer is yes, they will fit, but there are a few things you need to know before you make the switch. The first thing to keep in mind is that 243 heads have smaller combustion chambers than stock 5.3 heads.

This means that they’ll increase the compression ratio of your engine, which could lead to some problems down the road if not done carefully. You’ll also need to use different spark plugs and make sure your fuel system can handle the increased pressure. Overall, it’s definitely possible to put 243 heads on a 5.3, but it’s important to do your research and plan ahead before making any changes to your engine.

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