Flag Motorsports

06/27/2026

Well, this is about as bad as I've seen someone kill a 5.3! Seeing it cracked through that thick of a sleeve is something else. All this damage from a guide having worn out and a dropped valve. What's the worst way you've ever seen an engine taken out?

06/19/2026

A pair of our iron 6.0Ls going to their new homes! One will be powering a father/son 50s pickup project, and the other is going in an off-road Jeep. One of the best parts of the job, aside from building awesome engines, is getting to be a part of someone's project and seeing the vehicle it goes in. We love it even more when our clients swing by driving their Flag powered vehicle!

05/27/2026

Going from hydraulic roller to solid roller! Find the whole video on YouTube!

05/26/2026

Had a set of heads in to rebuild - I've never had guides splinter and explode like this when removing them. I'm not sure what off brand powdered metal guides these were but I hope to never see this again.

05/23/2026

We hope everyone is having a safe Memorial Day weekend and remembering why we have a long weekend. Some gave all 🇺🇲

05/22/2026

This LS2 came to us after suffering a failure within only a few hundred miles from being rebuilt. We discovered a bad align hone had caused this main cap to lose all register. When running, the main cap had moved, the crank had started to hit it and it killed the engine. Be very careful with your main caps and make sure you don't have damaged registers!

05/22/2026

This is the process we follow to fully recondition a set of LS7 cylinder heads for our customer’s 2006 C6 Z06. They received full guide replacement with CHE bronze guides, a 5 angle valve job, surfacing, and all new valves with a spring kit setup matched to the camshaft. Now they are ready to go back on the car and make power!

05/20/2026

After installing new cam bearings, we use the Bonefied Tools broach kit to swedge them to size for perfect cam fitment!

05/19/2026

It must be Tuesday! Our first Tear Down Tuesday in a while just went live on our YouTube channel. This one features a 6.2L L86 with lifter failure! Pop over and check it out, let us know what you think!

Welcome back to Tear Down Tuesday at Flag Motorsports! LT engines a...

04/25/2026

LT guys! We just finished our build documentation on Gabriel Griffin 's LT4 build for his ZL1 Camaro. If you want to build a 915RWHP/850RWTQ LT4 keeping the stock 1.7L blower at only 15psi of boost on E60, check out all the build details here! Fantastic photography by Gabe himself.

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.