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About Us

tested and Proven at the track

Our roots run deep into racing, where we use our racecars as a test bed for engine combinations, parts tolerances, and durability in some of the most rigorous torture testing we can put an engine through. This is how we formulate our engine combinations - by proving them in extremely harsh environments with drivers who are pushing them to the limit. If they can survive season after season, the combination will be successful for our clients as well.

Our team has a range of cars, from old-school muscle to modern race focused sport cars. Find us at the track when we’re not in the shop - we hope we’ll see you there as well.

 
 

Check Out the Latest Builds & News From Flag

Powering decorated race cars and dedicated drivers.

 
 
 
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Head to the website to read the write up on the engine build, tune, and results for @coreyfromtheset 6.0L project! Spoiler alert: he took first place in his first race with the new engine! We can take credit for the engine build and the tune, but Cor
Let's talk about PCV! What is it, why is it important, how do you properly route it, and answers to some common PCV questions can be found on our new tech blog post. We've also designed a diagram with detailed routing explanations to help you correct
Do you have a GM "LS" block you need help identifying? Have you needed a resource for what engines are actually LS engines vs Vortec or EcoTec? We just published a Resources page on our website including a comprehensive guide to identifying
Happy Friday everyone! This studded LS3 is almost ready to go into a classic truck. She's gonna be rowdy! . #enginebuilding #enginebuild #engineporn #enginebuilder #machinework #racecar #machinist #builtmotor #horsepower #enginerebuild #roadrace #fla
Purple people eater 6.0 coming soon to a race truck for @coreyfromtheset and his short course truck! Looking forward to seeing him install it and fire it up before his next race 🔥 . #enginebuilding #enginebuild #engineporn #enginebuilder #machinewor
High performance = @atiracing dampers every time! This 416 received a beautiful @wegnerautomotive black billet accessory drive with the industry leader in dampers behind it. For any performance engine of any kind we will always recommend ATI and no o
Stroker LS3 with full billet @wegnerautomotive accessory drive just wrapped up! Waiting on some amazing final touches, including some custom Wegner hidden coil pack valve covers. This engine is going in a seriously impressive classic Chevy truck in f
Swipe for the “after” on this engine! Our client was looking for a cammed LS3 for his off road hummer. We got his engine built with a @holleyperformance mid mount accessory drive, and then in the “after” photo we had George at