The big block Chevys as well as fords had problems with manifold exhaust leaks in motorhomes because of airflow problems. I did a lot of reading about this 15 years ago. The Chevy 454 in motorhomes were well known for blowing manifold gaskets and warping manifolds. There were also reports of cracking. Ford 460 had trouble with the end bolt holes breaking out. The recommendation that seemed to come up most on the Chevy was to have your existing manifolds machined true if they were not cracked. This was held up as a better repair than new manifolds as they had seasoned and stabilized. Also said to oversize the bolt holes by 1/16 inch to allow for more expansion and contraction during the heat cool cycle. It was recommended to use no manifold to head gasket. Their was a gm part # anti seiz(sp) they recommended using on the manifold to head connection surfaces. The Idea being that the first heat cycle would bake the anti-seiz in to a very hard and slick surface that would allow movement between the head and manifold as they heated because of the difference in there mass expand and contract at a different rate from each other. We used just good quality silver anti-seiz. I had this done to my 454 in a motorhome and put well over 20,000 miles on with no problems so far. It did a smoke a bit at start up the first time. The shop that did the work was skeptical of the procedure but said they had a lot of returns on using new manifolds as well as just replacing the gaskets so agreed to do this. The no gasket and anti seiz recommendation came from a GM service bulletin if I remember right.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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