Changing the exhaust on a 454
 

I'm looking at a boat with a 454 and the exhaust goes through the prop.Can I change it to go out the back?Please reply it could be a deal breaker for me...Thanks

absolutely, not sure what you would do with the Y pipe for thru prop, as long as there is room on the transom just get some tips and cut some holes

very easy job . don't sweat it

so I don't have to change the manifolds...Just get some tips,run the pipe andcut the holes and the way I go???

You need to install a Y blockoff plate on your transom assembly and disregard your Y or you can just simply put on the corsa captains choice setup and have the option of both and not go through the hassle of getting rid of the Y

basically, yes. you will have to either cap off the Y or remove it, thats what i'm not sure of

If you want to remove the Y it is easy but will probably require the engine to be pulled. It's held on by 4 bolts and comes off easy. I just took mine off and switched to thru hull. Merc makes the blank off plates and they bolt right on.

I have yanmar diesels so only one hole needed

I have done a few of these , make sure your measurements are accurate , get yourself a good quality hole saw and some epoxy resin to reseal the new holes . You will also need proper exhaust hose with two stainless hose clamps on each end . Your risers will point to where the holes need to be in transom . Make sure to give them enough drop !!! You may have to shift the engine forward slightly to remove the y-pipe or get out the sawzall and cut it enough to remove it . If you do move the engine make sure you realign it to the gimble bearing with the tool . They do sell a block off plate to put in place of the y-pipe . Last but not least use a high quality sealer on the tip flanges to keep the water on the outside of your boat .....:signs069:....Its all part of the fun....

What kind of boat is it? The job is sometimes more complicated on some boats w/intergrated platforms.

put some pvc caps in the y pipes ruber hose with clamps . leave the y pipe for now , then later if you pull the engine for work you can remove the y pipe then.

Hey guys its a Wellcraft Elite 222XL...

My boat has through transom exhaust and the Y pipes are still in place. The y pipes have rubber caps like you would get at the hardware store for blocking off plumbing pipe. 4 inch cap and hose clamps. When the engines come out, I'll remove the y pipes.

i removed thru prop and went thru transom on a chris scorpion, roughly the same as the elite of yours. only diff was the noise. now instead of screaming SLOW DOWN!!! at me she digs her fingernails into my arm...but yeah the perko plumbing caps work. you might need to cut a little off the top of the y's to make room for exh hoses to go out the back. not much though. the top of the y is close to the waterline. you don't want that cap underwater all the time. best is to pull motor and buy real block-off plate. be careful pulling bolts out of bottom of y. they break off into the transom assy. unpleasant!!