Mercruiser riser gaskets

[cooter2506]

I have a 1998 5.0. I was just reading on ebay looking for new exhaust manifolds( for my winter project) that I should be using an open riser gasket and not the restricted. Restricted is what came on the engine when I got it. Was wondering which one I should have in it. Thanks in advance.

 

[Sorrento 25]

Re: Mercruiser riser gaskets

I was wondering the same thing when I was ready to order mine and was told restricted for stern drive and open for inboard. I ordered restricted and the ones I replaced were also restricted.

 

[Don S]

Re: Mercruiser riser gaskets

See if this service bulletin from Merc helps.
http://www-alt.mercurymarine.com/mnetdata/Service/Cruiser/Bullet/99/mc9910r2.pdf

 

[cooter2506]

Re: Mercruiser riser gaskets

Well if I read that bulletin right. Since I do not have a hose hooked up to the riser I should be running the FULL or OPEN gasket not the restricted. Am I right? Am I hurting anything with running it restricted right now. Boat has had maybe 10 hrs on it since engine was put in. Plan on maybe another 5-10 before it gets put to bed for the winter.

 

[Don S]

Re: Mercruiser riser gaskets

Give me a few minutes and I will see if anything will go wrong in that time.

 

[cooter2506]

Re: Mercruiser riser gaskets

COOL you finally found your crystal ball I guess I do deserve that one, LOL.

 

[John_S]

Re: Mercruiser riser gaskets

Found the same thing on my '97 350 this spring. The only difference I could detect was the tops of the elbows seem to run a little cooler via palm of hand method.