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Exhaust Riser Spacer Block Kit 6 Inch used on Mercruiser Center riser Manifolds 1983-2002 V6 V8 Applications.
Used to raise the height of the exhaust riser to maintain a downward exhaust slope.
(GLM51240 and GLM51230) from 1983-present on V-6 & V-8 applications.
The kit comes complete with all hardware and gaskets.