Here are the differences: 243 heads came with 2.00 hollow stem intake valves (lighter) and 799 heads came with regular solid 2.00 intake valves. I am also looking fo a tbss or 07 NNSB intake. The LS engines designed with 799 heads were 5.3L and 4.8L truck engines. This also helps reduce emissions by allowing more complete fuel combustion in each cylinder. If you are looking for 799 LS heads,Allied Motor Partsis the best place to get them. It was first introduced in 1999 and was used for both light and commercial duty applications until it was discontinued in 2006, making way for the new generation of engines from GM's LS range. In addition, better materials can be used during this process such as stainless steel valves or bronze guides in order to reduce wear over time while still providing maximum performance benefits. As expected, the 799 heads offered the highest peak flow, with 250 cfm coming at 0.700-inch liftthough a value not generally relevant to most LS enthusiasts. The 799-cylinder head also weighs 26 lbs, the same as the 243 one. The shape is designed to increase airflow and power. For many people, selecting suitable cylinder heads can be pretty tricky. Why Chevy 706 Heads LS Make a Great Choice? - Allied Motor Parts The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. The combustion chamber is the space in the cylinder where the air/fuel mixture is ignited. Are the 799 heads on LS1 interchangeable? The size of the chamber can affect power and efficiency. They offer excellent performance with increased horsepower making it a preferred choice for a porting job. Mechanically similar,General Motors LS and LS-based Vortec engineswound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buickheck, even Saab, Hummer, and Isuzu got some LS love. It is important to understand the differences between 243 and 799 cylinder heads, as they are two of the most popular cylinder head options for a Chevy. Inside are ARP mains and head studs, and an M365 Melling oil pump. Learn how your comment data is processed. Single turbo systems using. Any other suggestions or maybe even a specific direction to go would be helpful thank you. Cam Motion ground the cam with 223/229 duration at 0.50; 596/596 lift on an LSA is 117. We loooove V8 Sky/Solstice swaps. Whether it was a Corvette, Camaro or Pontiac GTO, the 243 heads provided superior performance no matter what vehicle they were installed in.
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