What Is Fonse Performance and What Services Does It Offer?

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Fonse Performance is a dyno tuning and complete CNC machine shop serving street, strip, and marine engines. Its two core capabilities are chassis and engine dyno tuning, and full engine building and machining — from CNC block work to final assembly. If you have an engine that burns fuel and needs to be tuned, machined, or built, this is the type of shop that handles the whole job rather than a single step of it.

Dyno Tuning Services

The shop runs both chassis dyno tuning and engine dyno tuning, covering the two common ways a build gets dialed in: in the vehicle or on a stand.

What gets tuned

According to the shop, its dyno facility is set up to handle "anything that runs," across every make, model, and performance level. The stated range includes:

  • Classic carbureted V8s
  • Modern boosted EFI engines
  • Gas, ethanol, and methanol fuels
  • Nitrous setups
  • Boosted and naturally aspirated combinations

The practical takeaway: whether your build is an older carbureted setup or a modern forced-induction EFI engine, the shop positions itself as able to tune it rather than specializing in one era or induction type.

Chassis vs. engine dyno

Chassis Dyno Engine Dyno
What's tested Engine in the vehicle Engine on a stand
Typical use Real-world tune in the car, driveability and load conditions Break-in, verification, and tuning before the engine goes in
Stated approach "Tune it. Perfect it." "Built. Tested. Proven."

If you're deciding between the two, the general rule applies: chassis dyno tuning reflects how the engine behaves installed in the vehicle, while engine dyno tuning lets the builder verify and tune the engine before installation. The shop offers both, so the choice depends on where you are in the build.

Engine Building and Machining Services

Beyond tuning, Fonse Performance describes itself as a complete machine shop with full engine building capability. The listed services break down into these areas:

CNC engine block machining

Block machining is done on Haas CNC equipment, which the shop highlights as the basis for accuracy on every block. The stated goal is that every bore, deck, and surface meets exact specifications — whether you're rebuilding a classic or building a high-performance race engine.

Cylinder head machining

  • Surface milling / decking
  • Valve seat machining
  • Crack inspection and repair
  • Valve guide installation and machining

These cover street, performance, and racing applications, and the shop describes them as complete cylinder head machining and rebuilding solutions.

Crankshaft services

The crankshaft is described as the heart of the rotating assembly, where precision matters "at every thousandth of an inch." Services include inspection, grinding, polishing, and balancing for smooth, reliable performance.

Block honing

  • Precision honing and sizing
  • CNC plateau honing
  • Final bore sizing
  • Taper and out-of-round correction
  • Single and multi-stage honing
  • Plate honing with torque plates

Torque-plate honing matters because it simulates the head being bolted on, so the bores are sized under the same distortion the running engine will see.

Complete engine assembly

The shop offers full assembly on top of machining, combining what it describes as decades of experience with attention to detail. The stated result is engines that are balanced, sealed, and ready for street, strip, or marine use.

Who This Shop Is For

Fonse Performance fits builds where machining and tuning need to happen under one roof:

  • Engine builders and racers who want block, head, and crank work plus assembly from a single shop
  • Street and strip owners who need a chassis dyno tune on a carbureted or EFI combination
  • Marine customers, since marine is named alongside street and strip in the shop's scope
  • Anyone running alternative fuels or power adders — ethanol, methanol, nitrous, or boost

If your job is limited to a single operation (say, only a valve job), a general machine shop may be sufficient. The value here is the combination: precision CNC machining, full assembly, and dyno verification in one place.

What to Confirm Before Booking

The site does not publish pricing, turnaround times, or scheduling details. Before committing, ask directly about:

  • Current lead times for machining and assembly work
  • Whether your specific combination (fuel type, induction, engine platform) is one they've tuned recently
  • What you need to bring — complete engine, short block, or vehicle for chassis dyno time
  • Whether engine dyno testing is included in an assembly package or quoted separately

The shop lists its phone number as 856-627-5946 for direct contact.