Marv did an excellent job resurfacing my WRX heads and my car doesnt overheat no more. 5 Stars*****

Marv did an awesome job with my engine, I would definitely recommend him to anyone looking for engine work.

12 years and many Big Block Chevys machined, Marv is the most knowledgeable and best machinist around.MK Hammer Marine

Very nice guy sounds very ahnost will be dropping my moter see what happens

Marv builds high quality engines and has great service. He takes his time to make sure things are done correctly. It is worth checking out!

The turn around was not the fastest, but well worth the wait. I had my engine completely rebuilt and have had no leaks or any other issues with it. While it was in the shop i would call every few days to see how far along it was and thunder works always let me know how far along they were. They also painted my engine for me and it came out great! I will definitely be goin to them for my next build.

Flawless work!

Best machine shop around hands down my whole family uses marv. Tighter tolerances that factory. No need to go dwn the hill we have the best right here in Victorville. By the way you can’t Rush perfection!

Thunderworks has always delivered a quality product and builds some of the best engines on the market. He has built engines for some of the top racing teams and high performance boats and off road vehicles. His attention to detail and qaulity is top notch. I woudl highly recommend his work to anyone! We have an engine he built 12 years ago in an off road Jeep that is still running strong!

Brought my crankshaft in to be cut and micropolished. They cut it but never micropolished it. All the journals looked like brushed aluminum and had absolutely no shine. So it clearly was not done correctly. Called them and they said it was indeed micropolished. Would not refund my money.Took it to another shop and the journals were OUT OF SPEC AND OUT OF ROUND. They ruined my crankshaft and I had to purchase another.