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1970 440 HP Exhaust Manifolds & Hemi Orange Valve Covers

LSS&B

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Oct 1, 2018
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Location
Aylett, VA
Ran up against this problem when switching from chrome valve covers to stock. I have 1969 HP Exhaust Manifolds with stock 1970 Valve Covers. I used Chrysler Race Hemi Orange (pic below) to paint the valve covers (s/b Street Hemi Orange). I did not use primer. Clearance on the right side from HP exhaust manifold 2806900 to the valve cover is tight. After 30 miles of driving, I had burnt orange (pics below). Paint on left side valve cover also burning/bubbling.
I have also tried Duplicolor Hemi Orange. It flakes badly.
These manifolds destroy cork valve cover gaskets.
Car is not running lean or knocking. Engine runs excellent.

Is there a hemi orange paint that does not burn with these HP exhaust manifolds?
Is there a primer or clear coat that keeps the paint from burning with these HP exhaust manifolds?
Do I have to use an exhaust manifold gasket like Fel-Pro MS 90425 because the paint will burn otherwise, regardless of which paint I use?


2806900 HP Exhaust Manifold fits B-Body & C-Body Right side
IMG_20200201_172642338.jpg


Cannot take the heat
PXL_20240426_205352126.jpg


Close Proximity mount
PXL_20240502_193353649.jpg


Race Hemi now burnt orange
PXL_20240507_181900081.jpg

PXL_20240507_181909948.jpg
 
Last edited:
Is your timing off a little making your exhaust manifolds glow in the dark?
 
Your pic above is of 1968-79 RH manifold. The proper 70 manifold is 2899879. This would not have an effect on your paint....just thought you want to know the correct part number.
 
Your pic above is of 1968-79 RH manifold. The proper 70 manifold is 2899879. This would not have an effect on your paint....just thought you want to know the correct part number.

Accidental typo.
Meant 1968-69. Just to avoid confusion.
Corrected date in OP to 1969,
Since you know these manifolds, any suggestions on paint that will take the heat?
 
48 years of driving them and I have never burnt the paint off. Sounds like you're running full bore and lean with glowing exhausts..
 
I use the VHT high temp paints with good success. Their hemi orange is not the brightest in color but I have not had issues with burning paint off.
 
The motor home exhaust gaskets have a heat shield that protects the valve cover gasket. They will help with the heat problem.

DSC_4398 (Large).JPG
 
I would find the thickest gasket between head and manifold that would fit therefore putting the manifold farther away from valve cover
 
Same issue on my 69 440. Still no solution. I’m using the factory paint.
 
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