MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV FORCE 8 BF BOSS 290 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
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MACE PERFORMANCE 6.35MM PLENUM SPACER TO SUIT FPV FORCE 8 BF BOSS 290 5.4L V8