SKU: 12835143178

MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FORD FALCON BA BF FG BOSS 260 290 5.4L V8

Sale price$63.00 Regular price$70.00
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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8

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Description

MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FORD FALCON BA BF FG BOSS 260 290 5.4L V8Exclusive to Mace Engineering is our design registered plenum spacer to suit the Ford Boss 260 and 290 V8 engines. What is a plenum spacer and what does it do? A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less

Exclusive to Mace Engineering is our design-registered plenum spacer to suit the Ford Boss 260 and 290 V8 engines.

 

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

 

 

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur with standard manifolds in high horsepower/boost applications (due to poor air distribution).

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak.

 

Key benefits:

  • Design registered.
  • Reduces charge air temperature resulting in better power consistency and detonation prevention.
  • Power increase with no undesirable side effects.
  • Improved air distribution between each cylinder.
  • Improved fuel economy.
  • Easy to install.
  • Can be used as a replacement gasket.
  • Reusable.
  • Proven gains at an affordable price.

 

Contents:

  • 01 XPlenum spacer
  • 01 X Silicone gasket maker
  • 04 X Spacer bush

Vehicle Fitment Guide

 

Note: Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 12835143178

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Ginny Singh
Lake Worth, US
★★★★★ 5
Cute and functional!
Color: Orange
I love the color theme, I got this because I previously had a fully rhinestone one, but it got so hot that all of the rhinestones fell off, and I had to throw it away. This one looks pretty and feels nice while driving, has a good grip on your steering wheel and I’ve experienced no slipping. It matches my red panda-themed car.
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Reviewed in the United States on August 24, 2025
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Rhianna
Bozeman, US
★★★★★ 4
Good Fit and Feel!
Color: Orange
The orange is a little darker than I hoped for because my car is bright orange. But it fits and feels great and I still used it.
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Reviewed in the United States on May 30, 2026
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Heidi White
Port Orchard, US
★★★★★ 5
Exactly as described
Color: Yellow
Fits the standard steering wheel perfectly. The colors were true to what was shown online. The fuzzy is soft and does not shed. I would purchase again.
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Reviewed in the United States on March 17, 2026
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Nicole Spencer
Los Angeles, US
★★★★★ 1
will NEVER buy again
Color: Yellow, Color: Yellow
for one it looks nothing like the photo advertising it and for two packaging a steering wheel cover in this fashion makes no sense. also coloring is way off I wanted a bright yellow like the photo and this is a super pale yellow and the rainbow gems dont fit the look
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Reviewed in the United States on May 6, 2026
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Erica
Bozeman, US
★★★★★ 5
Car accessories
Color: Purple
My daughter loved this for her new car.
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Reviewed in the United States on March 17, 2026

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