Dimension measurement of the MerCruiser 5.7 thermostat housing?

[RustyNCA]

My boat does not have the factory style MerCruiser housing. I have been trying to find the dimensions of the factory style housing or an affordable housing. I'd hate to purchase a $200 housing only to discover it won't clear for my application I am working on. I need to know the height from the base where it mounts on the intake to the top of the housing.

Thank you for any help

Cheers
RustyNCA

 

[Bt Doctur]

the newest SS one is the shortest one. What kind of application are you trying to do?

 

[RustyNCA]

the newest SS one is the shortest one. What kind of application are you trying to do?

I have a Weiand 177 Blower setup I want to install on the 350 motor. It only has 2" of clearance between the intake and the snout.

 

[RustyNCA]

So, the application is a 350 MerCruiser in a 21 foot Hallett. I have alot of parts still to go, but I am struggling with how to deal with the water neck. I didn't realize the housing I have wasn't "normal" till just the other day. But you can see in the photos the clearance is very tight. It's 2".

 

[Scott Danforth]

You get a blower T-stat offset casting.

Since the blower manifold is aluminum, you really should get a heat exchanger for the motor.

 

[Fun Times]

You get a blower T-stat offset casting.

Similar to the last 3 designs near the bottom of the following page, https://www.jegs.com/p/Weiand/Weiand...94913/10002/-1

While this T/stat is for a big block, maybe they'll measure the height for you if you contact them through EBay, https://www.ebay.com/itm/MerCruiser...mostat-Housing-Assembly-809235C-/111398472455

 

[RustyNCA]

Thank you for the link, I do have the offset casting, interesting thing, it doesn't clear? I called and asked them at Weiand about it, they said it won't clear without the gasket, which I had on? That's a very tight tolerance. It does work great on the BBC manifold that I also have.

Actually the combination of the offset casting, if I can get it to work and the factory housing might work also it the MerCruiser is more the 2". Hadn't thought of that.

 

[RustyNCA]

You get a blower T-stat offset casting.

Since the blower manifold is aluminum, you really should get a heat exchanger for the motor.

The motor already has an aluminum edelbrock manifold on it painted black? I assumed that was part of the MerCruiser package?

 

[Scott Danforth]

if its a mercruiser manifold, it would have came with a dual alloy marine manifold as aluminum doesnt like non-glycol. its ok in fresh water, however any high morrow or brackish and it will corrode. in salt, you can watch it dissappear.

Merc doesnt use an off-the shelf edelbrock manifold for corrosion reasons. neither does volvo penta, PCM, Ilmore, Indmar

 

[Scott Danforth]

just an FYI stock mercruisers ame with cast iron intakes. new motors are all aluminum and come with heat exchangers.

 

[RustyNCA]

Well, I guess I need to take a closer look at my entire motor setup when I get home eh? I knew the through hull exhaust manifolds weren't stock, but I thought all the rest was stock MerCruiser stuff. I know it has an Edelbrock Performer RPM manifold on it now and had a Rochester carb, which started seeping fuel really bad through the throttle shaft, so I replaced it with one of the marine edelbrock 600 carbs I happened to have two of. To me it always sounded like it has a more than stock 350 cam in it, but figured that was also a MerCruiser setup.

Thanks for all the help