The 4.8L has a 3.27-inch . Stay away from the LS4 from front-wheel-drive cars. In an internal combustion engine, the compression ratio is the ratio between the volume of the cylinder and combustion chamber at their maximum and minimum values. But, it also means more heat inside the engine. Despite larger exhaust port volumes than either the 706 or 241, the 799 heads offered the least exhaust flow of the bunch, with a peak of just 191 cfm. Why Chevy 706 Heads LS Make a Great Choice? - Allied Motor Parts We also took the liberty of measuring the combustion chamber diameter (distance across) to illustrate how the factory sized them for their particular target bore size. Lq9 With 243 Heads Compression Ratio | caredcar.com I would also like to keep my 799 heads as well. Go there and search LS engines for a comprehensive collection of LS engine tech information.). The chamber volume on the 799 heads was within 2.5 cc's of the 706 heads, but the. Like the 317s, the 241 heads out-flowed the 706 heads, but once again, that airflow did not translate into power production. Check out the dyno graphs to see how much the 317s lost on this 5.3L test and you might think twice about what you choose for your next turbo LS. any input would be appreciated. Ask your tuner what injectors they prefer and have them ready to save yourself an extra trip to the dyno. The port volumes were within a couple of cc's of the 241 LS1 heads, and the peak flow differed by around 5 cfm despite the 706 heads having a smaller intake valve size. Daily driver with a above average cam. In an internal combustion engine, the compression ratio is the ratio between the volume of the cylinder and combustion chamber, In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space. But on the upside, both respond equally well to porting. I am looking at 5.3 with 862 heads to put in a 1950 fleetline. Converter recommended. Not knowing it is a vin(b) 5.3 l33ho. Luckily, these stock heads can be CNC-ported in order to increase the airflow and make them more powerful. The test engine was an easy choice, as the 5.3L was the go-to engine, especially for the power-adder crowd. If you're going to be driving on the street, you won't need as much power as someone who will be racing their car. 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. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower.
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