706 vs. 317 Mod­i­fied (Turbo) 5.3L

Chevy High Performance - - Best For Boost? -

Though LS en­thu­si­asts seem to think some sort of magic hap­pens when you in­tro­duce boost pres­sure from a turbo, the re­al­ity is that things ac­tu­ally re­main the same. The only change is usu­ally that the dif­fer­ences ex­pe­ri­enced nat­u­rally as­pi­rated oc­cur at a higher power level. This was the case when we added boost from the same sin­gle-turbo sys­tem to both sets of cylin­der heads. Run with the Pre­ci­sion turbo, ProCharger in­ter­cooler, and 317 heads (at 7 psi), the 5.3L pro­duced 691 hp at 6,700 rpm and 612 lb-ft of torque at 5,000 rpm. Af­ter run­ning the same setup with the 706 heads, the 5.3L pro­duced 706 hp at 6,500 rpm and 641 lb-ft of torque at 5,000 rpm. The gains of­fered by the ex­tra com­pres­sion of the 706 heads re­mained (and even in­creased slightly) un­der boost.

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