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lakeboat

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Log Exhaust Fitment
« on: July 04, 2021, 01:54:37 PM »
Hello,
I currently have a set of Nicson log manifolds on a BBC. There is a serious alignment issue with the thru hull fittings. Last time I put the motor in I had to clamp the 3.5" exhaust hose on the snail and ratchet strap the manifold to the head to get everything bolted up. This definitely created a lot of stress on everything.  I've never worked on boats before and just put it back together the way i bought it. ??? This time I'm looking for a better way.  I used to think maybe it was a different engine combo from the factory.  Now I'm leaning towards the possibility the engine was always Chevrolet and the manifolds were swapped out causing the misalignment. I'm looking for any information regarding who makes manifolds with a port approximately 2" longer than the Nicson to shift the centerline further to the side of the hull.
Any help is appreciated.
Thanks,
Joe
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mahony.2469

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Re: Log Exhaust Fitment
« Reply #1 on: July 04, 2021, 04:10:47 PM »
Here's what I'm running.....I had some exhaust pipe bent at a muffler shop to take up the difference.

Sent from my 5032W using SoCal Jet Boats mobile app

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lakeboat

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Re: Log Exhaust Fitment
« Reply #2 on: July 05, 2021, 09:55:39 PM »
Thanks for the reply! I envy the room you have to make that work.  Something I noticed in your photo, you seem to have a different deal on the end of your manifold.  What is that called and how does it keep water from entering the motor?

Update to the project.
I  mocked up a 1.5" spacer and bolted it in place with 3/8" all thread. I was hoping I could add a spacer  between the head and manifold to get a straighter  shot to the thru hull.
Didn't work for shit, the left to right got better but it lowered the outlet of the snail so much its almost as bad now in vertical misalignment as it was side to side before. 
So, again,  any advice appreciated.
 Not sure WTF to do. I get its an unknown whatever combo was in this boat before.  I've only had Chevys. I couldn't tell you what other combination would be wider by approx. 5" side to side, total. One of you might though and that information would be great.
Also if anyone knows about Sleekcraft? I just would like to know what manifold they used on this boat in 1986, and where to get a new set. Brand new, in a box, asap,, if possible.
Any ideas, comments, suggestions or complaints appreciated.

mahony.2469, thanks again for your photo.

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