No. With the EZ-Plate Systems sliding restrictor plate design, the carburetor, air filter, linkage, and fuel lines can all remain in place on the engine while changing a restrictor plate. Simply remove the nut and retaining cover, slide the restrictor plate out, insert the new plate, and place the cover and nut back on the spacer. It’s quick and easy and takes less than 30 seconds. Removal of the carb is only necessary when first installing the EZ-Plate system.

No. Simply remove the nut and retaining cover, slide the restrictor plate out of the spacer, then place the cover and nut back on and you’re ready to run all out, with no restriction.

For a typical installation, we recommend that the EZ-Plate system is mounted so that the restrictor plates will slide in and out of the spacer from the passenger side of the engine.

The 4150 system is a total of 1-inch thick, while the 4500 system is 3/4-inch thick.

No. The EZ-Plate System does not affect the air-fuel ratio.

No. The EZ-Plate System does not affect the ignition or require changes to the ignition timing of the engine.

No. Running a restrictor plate will not change the air/fuel ratio. All a restrictor plate does is reduce the volume of the air/fuel mixture being fed into the engine, which reduces the horsepower. The developers of the EZ-Plate System have thoroughly tested the use of restrictor plates on their drag cars for years, and run them with no adverse effects.

Each EZ-Plate System includes the carburetor spacer, retaining cover, nut, and 20 different sized restrictor plates.

Every EZ-Plate system is custom tailored to your specific vehicle, and includes 20 different sized restrictor plates for maximum adjustability. Depending on your race car’s specifications (i.e. engine size, gear ratio, tire size, weight, etc.) and the E.T. you’d like to run, the plate in the middle of this range will be the ideal plate to run your desired slower E.T. The full range of 20 plates allows you to still run the desired E.T. even in varying track and weather conditions.

To date, EZ-Plate Systems has never failed to have the correct plate range for a customer. Whether you want to slow down a few tenths, or a few seconds, we've got what you need!

Based on your supplied vehicle specifications, we try our very best to give you the correct range of 20 restrictor plates the first time. However, every car and engine is different. Similar to how a torque converter may need a little adjustment, sometimes we may need to revise the range of restrictor plates slightly in order to achieve the target E.T. using the middle plate. If running your car with the middle plate does not achieve the desired E.T., simply give us a call to let us know how far off it was. We will work with you to determine if you need an entire new range of 20 restrictor plates, or if you just need a few of the plates replaced. You then ship us the plates back, and we ship you the new plates. It’s that EZ!

The restrictor plates of the EZ-Plate System are designed to repeat every pass. However, if your car is not currently consistent, our system won’t magically make your car start running consistently. The plates will repeat every pass, to the extent allowable given your car’s ability to repeat. Other factors, such as staging, track and weather conditions, etc, may affect the repeatability of your car as well.

Yes. You can run nitrous plates, additional spacers, etc. with the EZ-Plate System.

Yes.

Yes. You can use the EZ-Plate System if you have a blower or turbocharger, as long as you have a carbureted engine.

No. Due to the square-flange design of the EZ-Plate System, it is only suitable for carbureted engines.