M35a2 Intake Manifold Bad Casting Or Rusted Out

[WhoMe08721]

Hey Guys,
Was removing the radiator and thermostat today and notice that my intake manifold is a little mess up inside. Was this a bad casting from the factory or is this rusted out. Should I be worried about this??? Attached are some picture.

 

[davidb56]

If coolant isn't getting into the air side of the intake, I'd clean it up and JB weld it. Maybe someone who has a spare one can look in it and comment.

 

[rustystud]

The water manifold is aluminum so that is not rust. Just a bit of corrosion. If your really concerned you can take it off and sand-blast it. Then paint the inside with a good Aluminum primer and high gloss paint. There are several "freeze plugs" on this manifold. So this would be a good time to replace them all. I went with stainless steel ones. Also replace the hoses.

 

[gimpyrobb]

If you decide to replace it, I have some take-offs available. I can't say when I'll be at the barn to be able to get pics, to see if mine are the same internally as yours.

 

[WhoMe08721]

Was Able To Look At (4) More Intake Manifold This Weekend and I Have Came To The Conclusion That the Sand Molds They Use For Casting Where Not That Good Back In The Day And That Mine Way OK. I Also Finally Found A New Radiator For Sale And Got It Installed This weekend.

 

[davidb56]

How many denero did the radiator set you back?

 

[WhoMe08721]

To Many $1000.00 For A NOS April 2017 Box Data

 

[M35A2-AZ]

I think that is caused by cavitation in the water system. I would use some JB weld or use some Alum. Devcon. Then use a good epoxy paint on the inside.

 

[davidb56]

theres a lot of copper there. I just purchased a small 50' roll of 10-3 romex......it was 85$. Radiators have to be sized to engine Liters, and physical size/fittings, so Big engines need more copper.