(We assume our engine was still breaking in when we ran the GPI – LS3 Intake Manifold Mod (Radius Rod Mod / Porting) as the second test of day one.) Low and behold, the numbers were up on it as well. We were surprised when it made a tick more power than our GPI – LS3 Intake Manifold Mod (Radius Rod Mod / Porting) tested the day before, so we reinstalled the GPI – LS3 Intake Manifold Mod (Radius Rod Mod / Porting) and ran it again back to back for a more accurate comparison. ![]() The intakes performance is accurately reflected to 7600 but the drastic drop after should be credited to the valvetrain for the remainder of the tests.)Īrmed with our injector extensions, we began day 2 by installing the FAST – LSXR Intake Manifold 102mm Intake Manifold for LS3, L99, L92, L76 (146302B) with a 92MM throttle body. (This set had some use in a previous test, so they seemed to be giving up a little earlier than that. 660″ Lift Platinum Valve Spring Kit for LSx Engines (SK001) we were running lose control of the LS3 valvetrain at about 7800 RPMs. We immediately observed what we had learned during a spintron session which is the Brian Tooley Racing –. The Holley LS3 Hi-Ram (300-117) did its job as a short runner manifold which is to move the power band higher. In a matter of minutes, we had our Holley LS3 Hi-Ram (300-117) installed with a 92mm Throttle body and set up the dyno for a 5K to 8K pull. (Be sure however and have a nice supply of every color of injector O-ring ever made because everyone who makes a manifold insists on making their hole a different size!) ![]() What the heck, we will just install the Holley LS3 Hi-Ram (300-117) which conveniently includes fuel rails which work with the short injectors. Next, we had planned to install the Fast 102 manifold with standard runners, but we had to change our plans as we neglected to procure any injector spacers (which are necessary on this manifold to run the LS3 short injectors with a stock fuel rail). We burned some daylight attempting to scab together a billet rail without proper bracketry only to concede and overnight some spacers!
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