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-   -   Exhaust header Hardin or Stainless marine (https://www.offshoreonly.com/forums/general-q/366228-exhaust-header-hardin-stainless-marine.html)

xlint89 05-10-2020 08:58 AM


Originally Posted by SB (Post 4737857)
For anyone that needs to install pipe plugs with ‘allen head’ recesses, hex bolt heads fit right in the recess. So, get proper size bolt head and two nuts that fit threaded part of bolt.

Insert head of bolt into allen head recess and use the two nuts (jammed into each other if coarse) and wallah. Much cheaper and easier to find than
1/2 and 9/16 allen wrenches. :)

Great tip. Mine unfortunately needed a 14mm. Not sure how difficult it would be to find that, but great idea none the less. Thanks


Originally Posted by nygman11 (Post 4737977)
I saw your thread when I was starting mine but I could not tell what brand exhaust you had.
I have 1997 model year 502's so by reading your post you think they will fit better.
I am just looking to replace the cast iron manifolds with something newer and better but I don't want to open up a can a worms. The boat is all stock and very dependable and I don't want to sacrifice that.
Hope you get your install figured out.

Post up a pic of your engine please. Would prob be able to see any fitment issues just by looking. As i wrote before, no problem with the 7.4L in my Bryant. This boat, need to move some things around.


Originally Posted by GLENAMY 242SS (Post 4737979)
Here is how I mounted my oil filter, remotely. The head is stock Mercruiser and the mounting bracket is from Stainless Marine. That is a Marshal pressure gauge.
https://cimg4.ibsrv.net/gimg/www.off...9234e0530a.jpg

That's actually a real simple idea. I would need to reroute the hose to the oil cooler, but that's to be expected. Thanks

nygman11 05-10-2020 10:42 AM

https://cimg9.ibsrv.net/gimg/www.off...5d8c931ff0.jpg
https://cimg8.ibsrv.net/gimg/www.off...317814b7f9.jpg
https://cimg2.ibsrv.net/gimg/www.off...bcfeef3277.jpg
There is not a lot of room and I was hoping to keep every thing in the stock locations.

1MOSES1 05-10-2020 06:21 PM

I’d go stainless Marine...

1MOSES1 05-10-2020 06:24 PM

https://cimg4.ibsrv.net/gimg/www.off...a3bf3da4d.jpeg

xlint89 05-10-2020 10:28 PM

You might need to modify the out drive reservoir location, but the oil filter locations would prob fit with the relocation brackets.

Here's how it mounted up on my 7.4L

https://cimg1.ibsrv.net/gimg/www.off...a4dc1c0ba8.jpg
https://cimg2.ibsrv.net/gimg/www.off...63ce2e1199.jpg

I'd go with stainless marine too, but, the cost of it is almost double. You can almost get 2 sets of Seaward for the 1 set of SS. And dam, those are purty...

SB 05-11-2020 08:06 AM

A 14mm headed bolt is as common as a 9/16” headed bolt. :) :wink:

nygman11 05-13-2020 07:55 AM

Went with the Stainless Marine.
Thanks for all of the input.

xlint89 05-13-2020 09:22 PM

Good choice. Quality stuff. Wish I had a set

StarLoone 07-17-2022 07:34 AM

I got a couple of seasons out of a set that I flush religiously every day of use. They have the saltwater treatment and all. They sprung a leak out of the starboard manifold that shot straight out a burst of water. Thank god I noticed at idle. I was incredibly disappointed. I had hoped they were the wholly grail but not the case.

xlint89 07-17-2022 11:32 AM


Originally Posted by StarLoone (Post 4838665)
I got a couple of seasons out of a set that I flush religiously every day of use. They have the saltwater treatment and all. They sprung a leak out of the starboard manifold that shot straight out a burst of water. Thank god I noticed at idle. I was incredibly disappointed. I had hoped they were the wholly grail but not the case.

Which brand did you have?


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