This discussion was part of the topic Name that Boat!!

We thought it deserved its own topic.  Matt is the new owner of this boat and we are here to share his enthusiasm and be a sounding board.


Matt Cowles, owner wrote:

For some reason these appear to be two-piece manifolds and risers (if you look closely you can see the bolts at the base of the risers into the manifolds) instead of the one piece ones with the rounded off tops.

 Has anyone seen this before?  Dear god...what have I gotten into?!  Given the external leaking on those risers, I'd like to get all that changed out.  Not sure if I like how that Hi-Tek set mentioned in another thread seems to block my access to the plugs and all.

 Do I keep the manifolds and add the stainless risers? Do I change out both in favor of a stock set-up (we'll be adding a genset probably next year)?


Reply by Timothy Miller November 1, 2013

First, take deep breaths.  What is leaking?  Joints, connections, gaskets?  What you have has been working for the better part of 45 years so unless the cast iron is leaking there is probably no reason to even be concerned about replacement.

 The risers are a bit large and strange looking but these are log style manifolds which may be different than what you are used to seeing.  This is a pic from the library entered by the Chief,



Reply by Matt Cowles November 1, 2013

Wow - that's an amazingly beautiful engine!

 The current corrosion and leaks are coming primarily from the lower corners of those risers where there's also some rust.  So it's coming from where seams are welded and the surrounding area.  Areas where pieces connect to one another appear to be alright.

 The last time we were down there was for the survey/sea trial, and the boats an hour away, but I'll be going back down there this weekend to snap some more pictures.


Reply by Timothy Miller November 1, 2013

 Aha!  Home made risers, no wonder they have square corners.  I retract my comments about working for the last 45 years.  Could be the welds need to be repaired but it would be good to begin the search for a good set of standard risers for log style manifolds.


Reply by Quentin November 1, 2013

 Welded steel risers leaking brackish water...I wouldn't bother even firing up the welder for 'em.

 Matt, there's all kinds of options on the risers. Relax mon! ;-)

 If yours are leaking, cast iron ones are readily available. If the OE style isn't to your liking, the ones that fit 440 Chryslers also work, and they flow lots better than the originals.

 The stainless ones are not going to make it hard to change the plugs unless you change them while sitting between the engines looking straight at the plugs. I find it much easier to change the plugs on mine while staring down at them from above, and I believe the stainless risers have better access in that orientation.

 Either way, relax. It'll all work out.




Reply by Matt Cowles November 2, 2013

 Aw - I'm not panicked! Heck, I've owned the boat less than a week and have already learned a ton. This is just the time to do some learning, get my bearings, and figure out my next move.

 The more I'm learning, though, the less scared I am of those big boys!

 Thanks all!

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Marine Manifold in NY makes copper risers. I have two pair for sale. With these narrower copper risers larger heat exchangers can be installed . Lenco Coolers makes them. 6'' instead of 5'' and a couple of inchs longer. I have two also.  You will learn that the cooling system is marginal at best.

I am amazed at the longivity of the original cast iron risers. I guess the design does not allow water to get into the aft engine cylinders if they fail compared to Mercruiser risers that should be changer out ever 3 to 4 years as I just hade to rebuild two engines on my Regal

Byron Smith

FBA 423019 H

Delray Beach Fl

Cummins 330 repower

Byron - I think I sent you a PM.  Please shoot me an email at MC1600 at yahoo dot com or give me a call at 7 zero 3-2 eight 2-3537.  Matt

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