- Joined
- Sep 28, 2002
- Messages
- 39,799
I seem to recall someone having exhaust manifold work performed and then experienceing valve damage shortly there after. Apparently their catalyst is bolted right to the manifold (some foreign designed engine). Anyway the documentation that came with my factory reman'd long block says to clean the intake (duh) and the exhaust manifolds and the catalytic converter. I guess the scavenging effect can have unexpected consequences of sucking debris back into the combustion chamber.