Stainless Risers for Merc/GLM Centeriser Manifolds
 

Hardin Marine stainless risers, 3-inch standard height, for use on center-riser Mercruiser/Mercury manifolds. I had stainless extensions TIG-welded onto the original outlets to eliminate reversion with big cams (these dump right near the transom tips).

I have used these on my 383 small block in my old boat as well as on the 454 Magnum in my Formula. They will add 40 HP to an otherwise stock setup. These risers bolt to ANY stock Mercruiser center-riser manifold (exclusing dry-joint applications).

Hardin Marine charges almost $900 for these risers.

Asking $500.

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