Gromm Racing Heads

I’d give 0 stars if that was an option It pains me to speak negatively in this setting as we have never shed any light in belief it comes back around. However we have publicly supported this company, and sent many others in their direction therefore I feel it is my responsibility to caution others to be extremely careful when choosing who to trust with your business. We’ve had repeated issues with engines from Gromm Racing, with four consecutive failures occurring in less than five hours of runtime each. Despite thorough investigations, including sending oil samples for analysis (which returned clear results), we’ve been met with deflection and accusations. Gromm Racing claimed the oil analysis company was lying to protect their product’s reputation. Our data logs confirmed that the engine operated within proper parameters, yet the failures—in some cases attributable to wear or fatigue—remain unexplained. Gromm Racing’s primary excuses for these failures are that they were caused by driving on the limiter and a lack of oiling—claims that our data logs directly contradict. The logs show the engine was within proper parameters and had sufficient oiling. Upon further inspection, it was found that the main bearings were clearanced too tight, resulting in excessive crank damage, while the rod bearings showed no signs of heat or wear. Additionally, an oil sample revealed high volumes of aluminum, indicating significant piston wear, which was also evident upon inspection of the cylinder walls. To make matters worse, we’ve had countless issues with Gromm Racing losing hardware, engine drive accessories, and even valve train components. On one occasion, valve train parts had to be pulled off an employee’s personal car just to complete our engine. Spare parts he deemed “not reusable” would be boxed up and taken to a storage room where we would have to request for them back. Additionally, a nitrous plate that was shipped with an intake was never found or returned, adding yet another layer of frustration to an already disappointing experience. Gromm Racing’s lack of support and transparency further compounds these problems. They refuse to provide part numbers, engine clearances, or even replacement parts, claiming these are “trade secrets.” Instead, we’re told to “figure it out ourselves.” Two years ago, we ordered billet main caps for an LSX block, paid for them, and never received them. The claim “I never billed you for a dyno session” was what we were met with when inquiring about them, however we were never invoiced and the main caps are still needed. The $4,500 block sat at their shop improperly stored and was allowed to rust, despite my repeated inquiries. Upon arrival to pick it up, I was told, “I would’ve cleaned it if I knew you were coming.” Additionally, the blower engine was taken to Gromm Racing for a teardown, inspection, reassembly, dyno tuning, and return over two years ago. Despite countless missed deadlines, we still don’t have the engine (it is now ready but not complete nor correct in terms of the injection lay out that was improperly redone nor the intake issue addressed). This repeated failure to meet commitments, coupled with an inflated ego and lack of accountability, is unacceptable. @highlight

Dec 23, 2024 · Madie Moon

Gromm racing completely rebuilt my engine from the ground up. They went above and beyond and reinforced my entire bed of my truck to withstand the new power it would be withstanding with a brand new engine. When I start her up the whole neighborhood can here it and that’s how I like it, definitely going to be coming back to Gromm whenever I need any engine works and I highly recommend them.

Mar 01, 2023 · Brian Schwab

I called today because I bought a truck with a 383 Chevy he assembled and I wanted his recommendation on oil. Not only did he give me a recommendation but he took the time on the phone to explain why he recommended it. He was also genuinely interested in which customer he originally built it for and asked me to call him back. I can say the engine has 30k on it and it still sounds great and has a TON of power.

Mar 14, 2018 · T H

Even though he had nothing to do with rebuilding my engine, the new owner returned my call after I left a voice mail asking about the correct motor oil to use for breaking in my particular engine Very helpful and knowledgeable. Willing to spend a lot of time on the phone. Gromm Racing continues to be in excellent hands.

Jun 13, 2017 · MrSwedjen

Spent an hour on the phone talking to shops that wanted to nerd bully me over details of a head porting job for my 302. Not only was shameer friendly but incredibly forthcoming and honest. His suggestions will save me money. He could of easily takin the job to port some old gt40p heads. We need more “stand up” shops like this. Can’t wait to actually need his skill set.

Oct 04, 2021 · Richard Robinson