Flag Motorsports built Gen 5 LT4 made 915RWHP/850RWTQ at 15psi with the factory 1.7L supercharger on E60. Let’s dive into the build details.

Corey races offroad in the 1400 class, and his old and tired 4.8 had been holding him back. He wanted to upgrade to a 6.0L and ensure it was built properly to last for many seasons to come. We used this engine to develop our offroad 6.0 truck package, and we tuned the engine once it was installed. Corey went on to take first place a week later at the Glen Helen Freedom Cup class 1400 race!

Our client Michael came to us as a referral from a local restoration shop we frequently work with. He has an autocross/roadrace 73 Camaro with full TCI suspension and had just blown up his stock junkyard LS1 at Chuckwalla the weekend before he got in touch. We discussed several options, desired goals, power numbers, and parts before settling on an LS3 stroker.