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Cast Iron / Stainless Steel Exhaust System - BBC Kit w/Stainless Silent Choice Risers 

  • Direct Replacement for Mercruiser Big Block Chevy 454/502 Manifolds and Risers
  • Manifolds Constructed from Cast Iron and painted with black corrosion resistant paint.
  • Silent Choice, 4" Risers and made from Polished 316L Stainless Steel.
  • Individual Runners for Improved Performance over Stock Manifolds
  • Replaces Mercruiser #807078T10 and 89011A8 Manifolds
  • Replaces Mercruiser #807988A03 and 44354A3 Risers
  • Includes Bolts and Gaskets
MSRP: $1,929.99
Your Price: $1,639.99
You Save: 15% off MSRP!

Additonal Info On This Product:
Cast Iron / Stainless Steel Exhaust System - BBC Kit w/Stainless Silent Choice Risers

These stock replacement aluminum manifolds use “LPC” or “Low Pressure Casting”. LPC is a casting method that uses the pressure of inert gas to force the molten liquid metal from the bottom of the holding pot through a riser pipe into the tooling mold directly above. After the casting cools and solidifies, the pressure is reduced. The pressure applied usually does not exceed 1.0 bar, hence “low pressure casting”. The technology of “Lost Foam” casting is carried out by gravitational force (0.0689 bar, 1 atmosphere pressure) while LPC is done by pressurizing the molten liquid metal, usually at around 0.3 ~ 0.8 bar, 4.35~11.6 atmosphere pressure. LPC can be carefully controlled to eliminate porosity in the casting wall. This is because the molten metal becomes denser as it is squeezed into the mold by pressure, thus preventing gas bubbles and inclusions. The results are as superior as those produced by forging (manifolds can not be produced by forging). The LPC method allows for improved filling of thin-walled parts and large areas of tooling.

Kit includes a pair of Cast Iron Manifolds and Stainless Steel Risers. The Stainless Steel risers are an excellent bolt on addition to standard cast iron manifold and give up to a 10 HP boost! All Hardware and gaskets are included for installation.
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