Greetings,

I have twin 350 Merc's with full fresh water cooling......I'm in the
process of replacing the risers, and when I disassembled them, I found
the typical stainless block-off plate sandwiched between two
gaskets.....

Looking at the new Merc part number and schematic, it seems that only
a single gasket is now used, and the stainless block-off plate is a
thing of the past...

Can anyone kindly confirm if in fact the current set-up only requires
the single block-off gasket (Merc # 27-863725 1), or is the stainless
block-off plate still required?

I've seen manifold/riser "kits" available, and they too only have the
block-off gasket, but if I'm going to the trouble, I want to be
sure....I guess they could have changed the gasket design so the
stainless plate is no longer needed, but......

Thanks a bunch!!!