Engine Builds & Rebuilds
Custom engine builds and rebuilds in Stillwater, Oklahoma.
Foulks Performance builds street, strip, and work-truck engines that actually work as a combination. From stock replacements to stronger rebuilds to full race combinations, Tony handles every job personally so the finished engine runs the way it was planned.
- LS & LT swaps
- Small block & big block
- Diesel rebuilds
Shop proof
The kind of engine work customers drive across Oklahoma for.
This is where Foulks stands apart from parts-changer shops. Tony plans the whole package, talks through the tradeoffs, and builds combinations that are supposed to stay together after the first hard pull, not just sound good in an estimate.
What's included
Engine work that respects the whole package.
Custom combinations
Rotating assembly, head selection, cam profile, and fuel system chosen to match the chassis, transmission, and power goals.
Stock rebuilds & refreshes
Honest rebuilds for daily drivers and work trucks that need the engine back to dependable service without overspending.
LS and LT swaps
Engine selection, installation, wiring harness integration, and transmission pairing for complete swap projects.
Diesel rebuilds
Full rebuilds on Duramax, Powerstroke, and Cummins platforms for trucks that still need to tow, pull, and work.
Street / strip builds
Engines planned to leave hard at the track and still be driveable on the street, not just part numbers stacked together.
Machine work coordination
Block prep, head work, balancing, and any outside machine shop services coordinated and quality-checked before assembly.
Who it's for
Drag racers, truck owners, and builders who need the engine done right.
This is the shop for customers who do not want to explain their goals three times to a service writer or hope the right parts were ordered. Whether it is a SS Camaro being pushed harder at the strip, a diesel truck that needs to be reliable again, or an engine swap that has to actually work together, the goal is the same: plan it correctly, build it once, and keep you informed along the way.
- Drag racers building street / strip combinations
- Truck owners needing a rebuild instead of a replacement
- DIY builders who need a shop to finish the engine correctly
- Daily drivers with tired motors that still have life left
Customer work
Real builds, real customers.
"Tony knows his stuff, goes out of his way above and beyond to make your stuff right."
Mike B."Put a new motor in my truck. Up and running like brand new. Responsive, experienced, and knowledgeable."
Sammy M. & Austin F."They never gave up on my Enclave. I appreciate all the hard work and highly recommend Foulks Performance."
Amy D.FAQ
Engine build questions, answered.
How much does an engine build cost in Stillwater, OK?
Engine build costs vary based on the platform (LS, Coyote, small block, big block, diesel), the parts selected, and performance goals. Tony discusses options and budget upfront before any work begins. Call or text (405) 714-8364 for a free estimate tailored to your specific build. For a full breakdown of what drives the cost, see the 2026 engine build cost guide.
What engine platforms does Foulks Performance build?
Foulks Performance builds LS, LT, small block Chevy, big block Chevy, Coyote, Ford modular, Mopar, and diesel platforms including Duramax, Powerstroke, and Cummins. The shop handles street builds, drag racing combinations, and heavy-duty work-truck rebuilds.
How long does an engine rebuild take?
Rebuild turnaround depends on parts availability, machine shop work, and the complexity of the build. Simple refreshes turn around quickly, while full custom combinations take longer. Tony provides a timeline estimate during the quote process.
Does Foulks Performance do LS swaps?
Yes. LS swaps are a core specialty. The shop handles engine selection, installation, wiring harness integration, EFI tuning, and transmission pairing for complete swap projects in Stillwater, Oklahoma.
Can Foulks Performance build an engine for drag racing?
Yes. The shop specializes in drag racing engine builds that understand the whole combination. Rotating assemblies, cylinder heads, camshaft profiles, and fuel system requirements are all planned to match the chassis and transmission.
Do you supply the parts or can I bring my own?
Both. Foulks Performance can source all parts or work with parts you have already purchased. Tony will talk through what makes sense for your budget and build goals before the work moves forward.
Ready to start
Talk through your engine build with Tony.
Shop details
- Foulks Performance
- 6219 E 68th St, Stillwater, OK 74074
- (405) 714-8364
- tony.foulks@yahoo.com
Common service area
- Stillwater
- Perry
- Cushing
- Ponca City
- Perkins
- Glencoe
- Yale
- Pawnee
- Guthrie
Best next step
Send the quote form with your vehicle details and build goals, or call/text Tony directly to talk through the combination first.