As expected, the big winner in our truck trio was the FAST LSXRT intake and FAST 102mm throttle body, which produced 492 hp at 7,100 rpm and 422 lb-ft at 5,800 rpm.

Kits are available for LS1/2/3/6 and 4.8/5.3 and 6.0 truck engines and are used in conjunction with a Holley dual plane LS intake ... The throttle body comes with ... Two throttle cable brackets ...

To establish a baseline, the modified LS1 was first run with a stock truck intake. Equipped as such, the 5.7L produced 512 hp at 6,700 rpm and 453 lb-ft of torque at 4,900 rpm. See All 14 Photos ...

The part throttle fuel was right on the money and only required a slight tweak of the wide open throttle fuel. As a ...