Glowing Exhaust Manifolds 1992 454 TBI 7.4L P30 Motorhome

[Fast355]

I ordered new fuel injectors 90lbph, it fired right up. good power. floor it a couple of times and the manifolds got hot red again. I didn't even have to go on the hill to test it. Now I feel really stuck! So we know then that the injectors are not the problem. Any thoughts ?

I would say if the power is good and its not overheating there is a good chance its just the load on the engine making the manifolds glow. The 350 in my Express has damn near burned the ceramic coating off the Doug Thorley headers on it and melted the plastic loom over the transmission that shielded the wiring harness. I had to reloom that section of harness.

My Titan made so much heat pulling a heavy trailer that the exhaust system made of stainless discolored from the front of the truck all the way to the rear and even discolored the T304 tips!

Before getting run hard...


After


These are just a few of the things that truck pulled while I had it.





I am sure the headers were just glowing when it was under load, especially on long uphill pulls. The stock manifolds are quite crack prone on these trucks and the catalytic converters built on the ends of the manifolds often burnout and become hollow.