What Engine Did 243 Heads Come On?

It is possible to tell which head casting you have by looking at the three-digit stamping adjacent to the valve cover; for example, the LS1 utilized head castings 339 and 806 from 1998 to 2004; from 1999 to 2004, it used head castings 853 and 241. From 2001 to 2006, the 243 head was available on the more powerful LS6 engine, which was used in C5 Corvettes.

A total of 243 heads were installed on the LS6 engine, which was produced from 2001 to 2006. It was originally designed for the C5 Corvette, but it was later adapted to the LQ4 and LQ9 in order to fulfill truck specifications.

What kind of heads does a GMC 243 have?

GM 243 heads are the third generation of cylinder heads from General Motors, and they are designed for V8 trucks, SUVs, vans, and high-performance applications. The 243 heads are referred to as LS6 heads since they were used on the LS6 engines that were produced between 2001 and 2006. The 243 heads have a D-shaped exhaust port and intake ports that are cathedral-shaped.

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How many CC’s are in a 243 head?

The number 241 was used on LS1 engines from 2001 to 2004. They both feature a 66.67 cc combustion chamber (10.1 CR), 200 cc intake runners, and 70 cc (round) exhaust ports, and they are both powered by a gasoline engine. The 243 head is an LS6/LS2 head from the 01+ model year.

What is the difference between LS1 and LS 243 heads?

The 243 heads have a D-shaped exhaust port and intake ports that are cathedral-shaped. The combustion chamber of the cylinder heads is smaller than the combustion chamber of the cylinder heads that were previously installed on LS1 engines. 243 is also more efficient than the heads that were previously discovered on LS1.

What are the advantages of 243 cylinder heads?

This design has cathedral-shaped intake ports as well as a D-shaped exhaust port, which serves to improve air and fuel intake while also allowing for smoother combustion and faster exhausting. Improved horsepower is generated as a result of this procedure, resulting in increased performance and economy.

Did the 5.3 come with 243 heads?

These days, the 4.8 and 5.3 are sent with 799(243) heads out of the factory. While it is possible to grind the heads in order to preserve compression, the heads will simply bolt on.

Did LS2 come with 243 heads?

The 243 head is an LS6/LS2 head from the 01+ model year. In order to increase compression (10.5 CR on the LS6), it features a smaller 64.45cc chamber as well as 210cc intake runners and 75cc D-shaped exhaust ports. All three were equipped with intake valves that were 2.00′ in length and exhaust valves that were 1.55′ in length.

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How much HP does 243 heads add?

On a bolt-on LS1, a factory set of 243 heads may produce around 20 horsepower more than an aftermarket pair. Because you already have a camera, you might be able to see a little bit more. If your budget does not allow for a complete porting work, don’t be concerned; simply switching to 243 will be a significant improvement.

What are 243 Chevy heads?

GM 243 heads are the third generation of cylinder heads from General Motors, and they are designed for V8 trucks, SUVs, vans, and high-performance applications. The 243 heads are referred to as LS6 heads since they were used on the LS6 engines that were produced between 2001 and 2006. The 243 heads have a D-shaped exhaust port and intake ports that are cathedral-shaped.

What LS motor has 823 heads?

The l92 or ls3 heads are used in the 823 heads.

Are 243 heads cathedral Port?

The 799/243 heads are essentially a 243 head with altered casting numbers, and they are considered to be the top of the line, factory, cathedral-port offers. When tested on a flow bench, the 799 head delivered 249 cfm at 700 lift on the intake and 191 cfm on the exhaust, respectively.

Did 4.8 LS come with 243 heads?

07 up 4.8 and 5.3 have 243 and 799 heads, respectively.

What is the LQ4 engine?

In general, between 1999 and 2007, the LQ4 was a 6.0L LS (Gen. 3) small block engine that was utilized in General Motors vehicles. The Vortec 6000 was the name given to it by the manufacturer for marketing purposes.

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What LS heads are best?

When General Motors created the LS6, it was particularly to outperform the LS1 as the best performance head available. It was so successful that the ″243″ casting was reused on the LS2. With the exception of the LQ9, which is a clone of the LS6, these are the highest-performing of the OEM cathedral ports available today.

How much HP does ported heads add?

How much horsepower does a port and polish provide? Head porting is unquestionably the most important component of increasing horsepower. A truly good port job can result in an increase of 20-30 percent.

What LS heads are cathedral Port?

LS1 cathedral port heads were available on the original (Gen III) model, but they were also utilized on the more performance-oriented LS2 and LS6 models. Cathedral port heads were installed on literally millions of truck types, including the 4.8L LR4, the 5.3L LM7, and the 6.0L LQ4, among others.

What’s the difference between 241 and 243 heads?

The 243 heads have a 10 cfm increase in flow on the intake side, and a 7 cfm increase in flow on the exhaust side (if memory serves me correctly). Compared to the 243s, the combustion chamber is three cubic centimeters smaller. Both sets of heads have valves with the same size bores.

What LS engine has 706 heads?

The LS 706 Heads were installed in a variety of Chevrolet vehicles, and they were designed to work with the high-output LM7, LR4, and LM4 5.3-liter engines. This set of high-geared cylinder heads has been rebuilt by engine specialists at a far lower cost, resulting in their being the best-performing cathedral-port factory heads now available on the market.

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