The water neck thermostat housing extension has rotted thru on my B&M 250 superchargers..its the one that works with the stock Mercrusier cooling system that came on the 420 HP 454 Checy Big Block.. I found a replacement manifold and I have looked at all the weiand and holly acc. for the water neck extension and it looks like they no longer make parts for these units,does any one make a replacement unit that will work?

like this??????

http://www.diamondperformanceparts.c...cat=250&page=4

the weiand one should work, I have a weiand one but really don't want to sell until I figure what I'm going to do with the blower setup

I have some of that old B&M stuff (new old stock) , can you post a photo?

The part we need comes from the front of the B&M manifold and connects the Mercrusier cast iron part (thermostat /housing hose manifold from mercrusier to the B&M manifold)
The part that was linked is like the mecrusier part, the part that supports that unit and bolts to the B&M blower manifold is what we are looking for

I have two offsets off a early 90,s 177 it is sort of a adapter not a hole ther. unit almost a S shape no rott boat came from wis. and had about 79 hrs. on it

If you can post a picture that would help, I will try to get one but I am out on the road this week.
Its about 12 inches long 5 inches wide with normal water neck openings at each end. It is shaped like an "S" with one end rotated 45 degrees up and 90 degrees to one side and two small bolt holes tapped into a thicker casting area near one end to support it to the face of the blower

You might want to convert to the conventional 250 blower intake manifold.

we have the standard intake manifold for the 250 on it now, this is just an extension to adapt the stock mercusier cooling hoses to it...but if we cant find the extension we might have to just go to the bypass system

OOOOHHHHH