Manifold risers

Heat and a dead blow hammer

use a putty knife or a small screw driver and get the lock washers free first, then use the putty knife in between the two pieces and t should come apart.

Throw them in the junk pile and buy new.It's not worth it.I tried fixing mine and it was more headache than anything else.There comes a time when you just have to piut the money on the line.Who said boats were cheap?

So I got the one off by using a little PB blaster and torquing the nuts evenly like an built-in press until they were all tight then I beat it with a block of wood and a hammer. I finally got some movement that way. The other side slid right off with no force or anything.

Now I have them apart and I don't really see anything that looks really bad actually I think they look pretty good except for where the gasket meets up with the manifold and the riser the surface on the riser is really rough and not in very good shape and on the bottom of both there are three small holes for the water and one is broke out and on both there is two types of bolts at the bottom one goes all the way through to the exhaust chamber and the other is a drain for the water. What is the purpose of the one that goes all the way through? One seems to have been taped out bigger than the other? Could it be leaking around one off these bolts?

I think just getting the end of the risers milld so that they have a good surface and getting that one spot fixed and putting some new bolts in and new gaskets and I think that should solve my problem or am I thinking wrong? Can I still get gaskets for this style of manifolds/risers?

I will try and get some pics this weekend.....

Thanks

They should look very nice after a media blast, good luck

This is how I got my boat,the guy didn't know how to work on it and someone told him he needed new manifolds at $600.I ended up making my own gaskets and bead blasting them.Don't know why the different size holes,but mine are the same.You dont have much to lose by trying to fix them.

68- In all honesty back when I put mine together it was late 80's early 90's.At the time I did not know if H&M were still around.It was easier just to make them.Many auto parts stores carry gasket material,but for this application, stay away from the stuff made out of cork.I used the material that looks like cardboard. Holman Moody can be reached at 704-583-2888.The old part number for these gaskets are C4HM-9450-MB1.It might be worth a call to see if they have them. Actually nothing was wrong with mine,I took them apart to clean them up and check them, and someone was facinated with black(they had black seats and motorbox cover also,talk about hot) and had painted them and they were peeling.

68, The repair is not easy but can be done. The outside wall will need to be cut open so the wall between the cooling and exhaust can be welded. Then the hole cut in the ouside patched and welded. The danger is until you get the hole cut in the outside you don't know the condition of the inside wall. Take them to your welder and see what he has to say. It sure sounds like these were frozen at one time because of not draining them. Considering how rare thy are they may be still worth repairing.

Well, bad news, on friday we cut the exhaust manifolds open, we cut a patch out about 4x5" and you could not see how far the crack went it just kept going so we decided that it was not worth repairing so I am in the market for new/used ones.

So does anyone want some cut up h/m manifolds? I do have the h/m risers that to my knowledge are still in good shape so start the bidding.......

Does anyone have any suggestions on new ones? am a little tight on cash right now so the cheeper the better.... does anyone have any used ones around.

Help me out... Thanks. :)

B

Bolt torques? Did you get hose since you are changing the style of the manifold?

Someone will know the proper torque for the bolts but then you need a torque wrench to measure it. I however would bet there are plenty of people who never torque them to specs.

Sounds good I will see how it goes!

Thanks

B

Thanks for the torque specs!



The manifolds came in yesterday and I did a little nascar pit crew in the garage and got them on and went down to the river and it ran great, it has a lot more power it feels like at the top end!

$700 and back on the river!

Thanks