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December 2023 by juan gonzalez
Very professional and knowledgeable
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May 2023 by Rich Lopez
By far the best shop in the Bay to get your engine right!
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May 2023 by BayArea 5.7
By far the best shop in the Bay to get your engine right!
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March 2023 by Brian Schwab
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.Services: Motor building
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December 2021 by OldMeanRoy
The best.
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November 2021 by Xhevdet Kraja
Great service ?Quality race engines!
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October 2021 by Richard Robinson
Spent an hour on the phone talking to shops that wanted to n*** 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.Service: Engine repair
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August 2021 by Will B.
Worst experience I've ever had from start to finish. Took an engine there that was vibrating and Semir diagnosed it as unbalanced and quoted me for a rebuild. Said it would be internally balanced, and then later found out he externally balanced it without consulting me or even telling me. After a total of 10 months and telling me it would be done in 2 weeks for 6 months of that he finally "finished" my 347 and it was put back in the car. Many bolts and the distributor were loose and upon first start up the cam gear snapped and so it was sent back to him to fix. Once it was finally fired up it seemed like it was misfiring and the valve train was very chattery so it was sent back to him again. He gave me a whole line of b******* about how it was my electrical system and he went back and readjusted the rocker arms. Got it back, still had loud valve train noise and felt like it was vibrating. He then said it could possibly be a clutch that was out of balance, but that was very very rare. So put in a new clutch and in got a little better, but still seemed like it was misfiring. Got a new efi harness, injectors, and maf going off the assumption he had properly adjusted the rocker arms, but still misfiring. Had a tuner look at it a the passenger side bank was significantly leaner than driver side so I had the intake taken off and valve cover and what'd ya know there were metal shavings all over cylinder two rocker arm and valve which the intake manifold is over. On top of all that I found a metal chunk in the oil pan during the first oil change and was told to run 20w-50 by Semir instead of the 10w-30 he recommended to fix a low oil pressure problem that appeared after less than 100 miles of driving. He then basically tried to blame me because the clutch wasn't balanced and said that somehow could've caused the metal chunk in the engine because it was so bad and to kick rocks. Did a clutch also cause the rocker arm to not be adjusted properly from the first start? C'mon. At the end of the day Semir is so cocky that when it was sent back twice he wanted to blame everyone, but himself instead of spending the hour it takes to remove the upper intake and adjust the rocker arms. Now I'm left with a motor full of metal shavings I can't run, he won't return an email and won't answer his phone. I've even offered to pay the labor to remove the motor so he can fix the problems, and he's too full of himself to even respond. I'm sure a ton of people have had good experiences, but he completely screwed me and now I'm out thousands of dollars with a motor and car I can't even enjoy. This is the problem with shops that promote themselves on social media because they can block and delete all the negative posts and comments, but the truth is if he's not even willing to own up to his mistakes and simply fix the engine he built for me it could happen to any one else and there are no repercussions for him.
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April 2021 by Michael W.
Semir and crew went above and beyond for my cars performance . The precision machining and tuning service provided by Semir ,Dave and Gabe led too successful start to Finnish hp tq and drivability. I can appreciate the time and knowledge Theses individuals put forth to excellence. Semirs recommendations proved to be The right ones. Thanks to the Gromm Racing crew for your dedication to keeping the performance alive . I highly recommend this business.
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April 2020 by John T.
I went to Gromm to get a vortec head that I pick off the chevy Tahoe. I brought to Gromm to get it deck and check. But I decided to change my route because it will cost too much money for me to upgrade my Chevy 350 tbi to a vortec head. The cost is the tbi manifold which only GM makes and they cost. I called Gromm three days later to see if I can cancel my order and they were very nice about it. I would recommend people here because they are honest which is hard to come by these days. I would total come back if I need any machine done to my engine head or etc.
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October 2019 by David M. Taylor
My dead and broken Volvo engine is alive again, thanks to Semir at Gromm.
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June 2019 by Jobee Katarzy
I deliver their magazines. Always friendly and knowledgeable.
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June 2019 by Gary Begay
Honest and knowledgeable Helpful .
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April 2019 by Green light Gabe
Owner pointed out faults in machine work that had been done by a previous shop (not going to name names) and helped me through every step of re-doing my LS7 heads. They are very knowledgable and friendly.
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April 2019 by Seth Patterson
Samir went above and beyond my expectations to make sure my cylinder head was perfect
