2/1/2024 0 Comments Numbers 6.0![]() Of course, the question now is how would the four heads act under boost where the additional flow required might tax the maximum flow potential of the small-valve 5. The 241 heads performed slightly better than the 317s, and the 799s were better still. At the very least, the 317s would need more boost to reach any given power level than the 706 heads, and besides, a compression ratio of 9.5:1 works well on a turbo application. Though the lower compression might make them attractive for the turbo (or blower) crowd, there is a big gap in power that must be overcome before the 317s can start making more power than the standard 706s. Though they offer plenty of flow, they also started with a huge drop in compression (from 9.5:1 to 8.3:1), and therefore power. It is no surprise that the 317 heads made the least power. Now, combine that with the fact that the 706 heads-the same set everyone throws away-made the most power, and we might have just turned the LS world upside down. Designed specifically for a 6.0L application, the 317 heads also had the largest chamber diameter of 3.923 inches.Ĭheck out the graphs for a full rundown, but the big surprise was that the amazing power of the legendary 799 (243) heads never materialized. 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. The 317 heads are often used on turbo small-block 5.3L builds, but the lack of compression really takes its toll on power. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). ![]() The massive chamber volume of 71.5 cc's put them a full 10 cc's over the 706 heads. What made the 317 heads both kissed and cursed was the combustion chamber size. The peak flow numbers differed by just 7 cfm at 0.700 lift. The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. Use the following form, to convert any other scientific notation into decimal notation. According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads. 1.0e-6 is a scientific notation used in mathematics, physics, chemistry, astronomy and other sciences to handle either very large or very small numbers.
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