PowerFlow Plus 85-Degree Risers (Black) 

Black PowerFlow Plus 85-deg Riser (Sold in pairs)

IMCO's innovative patented cast aluminum manifolds and risers are designed with 33" internal runners for those 510 and bigger cubic inch, naturally aspirated, or blown big block Chevy motors. Fully water-jacketed with NO water passing though the flange area of the manifold or riser pipe. Manifold has 2 1⁄4" primary runners they are equal to any tubular header on the market today. Dyno results have proven that PowerFlow Plus out performs most headers in torque, rpm, horsepower, and most of all longevity. Risers are available in three different configurations, three different heights, and two finishes Polished or Black. Black manifolds are hard coat anodized inside and out to withstand tough marine environments. All stainless steel tail pipes are custom made to your exact specifications. We also offer several different internal mufflers systems for you to choose. Please call IMCO for further information.