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Risers


My 1994 390 CPMY has 7.4 carb Mercruiser (GM) engines, closed cooled, full system. Stamped on exhaust riser is 807988-C. I see numbers ending in A3, Q, etc. What is the difference? I know Merc makes cast iron, e coated and ceramic coated. I dont think the ceramic coated are worth the huge upcharge, as they dont last a lot longer.

Any insites? I have used Osco before, and Barr. NEVER GLM (Good Luck Marine)!

Thanks for any input!

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