Y Pipe Block Off?
 

looking for a block off plate or something for my 454 magnum , I deleted the silent choice exhaust and obviously im not pulling the motor to remove y pipe, does anyone know a good quality block off for them?

thanks
Dan

Have a look here
http://www.cpperformance.com/p-12573...sert-caps.aspx

Go to hardware store & get yourself a 4" rubber pipe cap and put it on Y pipe with hose clamp.
This works.

This plate is used to block off the exhaust port AFTER you remove the "Y" pipe. The OP stated he was not removing the "Y" pipe.

OP: AllDodge has it right. These are good option.

Aside from that, you should really consider doing this right and pulling the motor to remove the "Y" pipe and properly block off the exhaust port. Once the silent choice is removed the Y-pipe will be unsupported. It is cast aluminum and if it gets a really good whack could crack and then you have a 3" open pipe to the outside. Having said that, plenty of people of just blocked it off without issue; just weigh your risk appetite.

so true!!!

Personally I would not remove the "Y" pipe, some day someone might want silent choice again.
If you want to spend the extra money for the pretty, fancy plugs from CP let me know I might be able to get them a little cheaper. Other wise go get the rubber plug & double hose clamp it. That will be no different than the rubber coupler from factory.

Totally agree.

Ok, 1st thing. Get 2 hardware store caps. Put them on. Launch the boat. Take them off. How close is waterline to top of Y?

Why do you care where the waterline is??

That inch or so is how close to sinking you are if that 3 buck home depot pipe cap pops off or tears. I am gonna do a little measuring out back. You can also cap off exhaust hole on outside where exhaust boot went. Then there are 2 exhaust vents about an inch in diameter. I am sure there is a rubber plug or wooden Dowell pin to plug them off. Then with both sides of the exhaust Y closed off it is a somewhat less scary situation.

These
http://www.cpperformance.com/images/...e/73997_1_.jpg .

That is what OP just removed. Only switchable.

I just went thru all this over winter. I've personally left Y pipes in and plugged them in the past, however I don't like the look of them sitting there or their hindrance. This time the engines were out so I made a few block off plates and put them on with 5200. So far so good. I think it's personally a choice of the amount of work you want to do.

Side note... Don't mess with trying to cap it from the outside. Not worth the time or effort.

I agree. One of my boats I capped them off. Then, removed motor for mod's and removed Y-pipe at that time. My god how nice it is not to have that fuking Y pipe in the way. Everything become easier. Way easier.

dereknkathy - why are you so hard up by not using a rubber pipe plug ?

Schit, on an Alpha boat, I even have one on the transom assembly and one on the outdrive exhaust inlet. 10yrs or more ?

the rubber caps from home depot are really to cap top of pipe to keep unpleasant odors in your sewage system and out of your house. if you went downstairs and put that cap where there was gonna be a 3 inch diameter column of poop water pushing against it, you would be smelling poop in the near future. the stainless ones in post 2 that clamp on with your existing exhaust bellows don't scare me, just those flimsy rubber caps. and capping off the outside, even if not perfectly sealed would slow the incoming water down if something bad happened to the inside caps or y pipe broke or rotted through. that would be 5 to 10 bucks well spent.

^^^^ actually..... When I lived near the Envision boat factory, they gave me a set made of fiberglass to cap mine on my old Mach 1. They were oval shape just like the Y pipe connection. I was told they installed them on all their boats if the silent choice option wasn't checked.

Thanks for mentioning that. I've seen a bunch of those years back (silent choise was illegal to have here) and I haven't been able to find a source.

Question.
 

why if its capped from outside am i still getting water into y pipe.