Glowing Exhaust Manifolds 1992 454 TBI 7.4L P30 Motorhome

[Fast355]

Thanks for your thoughts! I put brand new exhaust manifolds on as part of my rebuild!!

I am confused at how the exhaust manifolds have anything to do with the intake manifold.

What I was saying is the 455 Oldsmobile manifolds were known to crack under the carburetor in the exhaust crossover passageway and when the engine was working hard and hot the crack would expand and dump exhaust gasses right back into the intake charge.