Mercruiser V6 Exhaust conversion 1 pc to 2 pc

It looks like the 1pc were only used 1996-2000. Short lived... so they must have been bad design. Bondo has informed me in another thread that these manifolds need to depart the boat asap. So, I have been researching the conversion kit for converting exhaust manifolds from old 1pc to 2pc. Some people have entire kits. Some, just the conversion kit that comes with exhaust boots and clamps... but i would still need elbows. Anyways, what is special about the kit? It looks like it includes hardware that attaches to regular manifolds and risers.

I can buy grade 5 or 8 bolts and ss clamps at the hardware store. So what makes the kit so special?

I have my eye on some osco manifolds and risers... and it comes with bolts and gaskets. But i will still need elbows and boots. I have found some used elbows on ebay. But like i am wondering, do i need special elbows to make this work? Anyone that has completed this conversion please chime in and let me know.

p/n's i have researched....
kit: 864293a02
riser: 807988a03
manifold: 99746a17
elbow: 14478t01

I guess the real question is could i make this work with...
http://www.ebay.com/itm/MERCRUISER-..._Accessories_Gear&vxp=mtr&hash=item19d06f7f9b

http://www.mercexhaust.com/osco-mer...st-manifold-kit-807988q03-99746a17-9745-4354/

What else would i need? Also, would it be wrong to sell the 1pc manifolds on ebay? They have not failed... still usable.

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

You can get the entire kit here.

http://www.mooreperformance.info/MercruiserV6conversionkit.html

Ive heard good and bad about GLM, most have good luck with them it seems. If i were in your shoes id go with the aluminum kit. Its not often you get the chance to save weight in a boat.

Good luck!

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

Well, i was trying to save a little by making my own "kit." Seems like GLM gets a thumbs down on their manifolds. Yes, they are easy to find, cheap, kits made by glm. I would pay a little more for the osco manifolds just for ease of fitment. I was hoping i could make up the extra expense by finding the right parts to make the install work.

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

Here's all the part you need to convert single (batwing) manifolds to something that won't destroy your engine...

2x Dry-joint Manifold: -864612T01
2x manifold gasket: 27-99757
2x Dry-joint Elbows: -864591T02
2x elbow gasket: 27-864850A02
2x upper rubber tube: 32-44348001
2x Exhaust elbow tube(aluminium): -865947A01
2x lower rubber tube: 32-14358001
16x 4” S/S hose clamps


Cheers,

Chris......

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

achris said:

Here's all the part you need to convert single (batwing) manifolds to something that won't destroy your engine...

2x Dry-joint Manifold: -864612T01
2x manifold gasket: 27-99757
2x Dry-joint Elbows: -864591T02
2x elbow gasket: 27-864850A02
2x upper rubber tube: 32-44348001
2x Exhaust elbow tube(aluminium): -865947A01
2x lower rubber tube: 32-14358001
16x 4” S/S hose clamps


Cheers,

Chris......

Click to expand...

Is this all OEM Merc? What about the Y-pipe? Re-use the original 1-piece or replace with newer 2-piece? Looking at this option for my '97.

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

G22inSC said:

Is this all OEM Merc? What about the Y-pipe? Re-use the original 1-piece or replace with newer 2-piece? Looking at this option for my '97.

Click to expand...

Uses the same Y-pipe and shutters....

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

achris said:

Uses the same Y-pipe and shutters....

Click to expand...

Meaning no engine removal to convert right. Just pull from Y-pipe connection forward to the heads and replace it all.

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

G22inSC said:

Meaning no engine removal to convert right. Just pull from Y-pipe connection forward to the heads and replace it all.

Click to expand...

You're good....

EDIT: just found this at Michigan Motorz... -> http://www.michiganmotorz.com/mercr...exhaust-manifold-riser-2002current-p-424.html

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

Chris, I got your pm.... and I thank you for all the part numbers. I just think its a bit much for me right now. I went ahead and bought the manifolds and risers in my links in my original post. After all is done, I will have about $650 in the whole setup. My stingray had the original manifolds and that boat was over 20 years old... I don't see myself keeping this boat for near that long.

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

I got my manifolds and risers the other night. Shot them with some rustoleum gloss black... hope that doesn't take all season to burn in. Osco look like some nice pieces. And my used elbows and boots seem like they will be just fine. So all done I have less than $650 in my new setup. The only hiccup i see is the water fitting on the bottom of the manifold is in a slightly different spot than the originals... so that hose will need trimmed on both sides.

Re: Mercruiser V6 Exhaust conversion 1 pc to 2 pc

hope that doesn't take all season to burn in.

Click to expand...

Ayuh,... Cool,... They don't get all That hot, 'n the paint won't get past Dry, 'n Hard....