SKU: 95781536554

MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV GT BA BF FG BOSS 290 315 5.4L V8

Sale price$72.86 Regular price$80.95
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV GT BA BF FG BOSS 290 315 5.4L V8Exclusive to Mace Engineering is our design registered plenum spacer to suit FPV Boss 290 and 315 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

Exclusive to Mace Engineering is our design-registered plenum spacer to suit FPV Boss 290 and 315 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: 95781536554

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Poodle Lover
Los Angeles, US
★★★★★ 5
Great price and high quality set!
Great price and packaged well. Knifes are sharp. The tips of each had plastic for shipping protection.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
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Yilainy franco
Battle Creek, US
★★★★★ 3
Sharp knives, but some defects
The knives cut well and are generally functional. However, I had some issues with the overall quality. The handle doesn’t feel secure when holding it and arrived slightly peeled, which raises concerns about durability. Additionally, the largest knife arrived with a slightly bent tip, which was disappointing. They work, but the quality control and packaging could definitely be improved. For these reasons, I can’t give a higher rating.
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Reviewed in the United States on January 24, 2026
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Mike
Houston, US
★★★★★ 5
Top quality set and gorgeous
Color: White
Absolutely beautiful set and very very sharp out of the box it looks fantastic it feels great in your hands not flimsy very strong solid knife set I highly recommend I love it Great price too
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Reviewed in the United States on May 14, 2026
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BusyMama2
Alexandria, US
★★★★★ 5
Impressive…
Color: Black, Color: Black
My first knife set! All I can say is it’s really sharp and the quality of these knife’s and block is sturdy and beautiful in person. I cook everyday and this is the far best one I ever have! You won’t regret it getting this well spent for my money :)
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Reviewed in the United States on April 13, 2026
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Yijing
Boise, US
★★★★★ 5
Good quality
Color: White, Color: White
5 Stars - Excellent Quality and Performance! I couldn't be happier with this knife set! Each knife is incredibly sharp right out of the box and cuts through everything with ease—whether it's vegetables, meat, or bread. The handles are comfortable to hold and well-balanced, making food prep a breeze. The design is sleek and looks great in my kitchen. I've used them daily for a few weeks now, and they’re still holding up perfectly. This set offers outstanding quality at a great price. Highly recommended for home cooks and pros alike!
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Reviewed in the United States on April 4, 2025

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