Is it ok to seafoam the intake on one of thes plastic manifolded 5.4 motors? Customer was askin me today and I've never done it to a phenolic manifold before. Also his main concern is that his injectors are so loud that the thing sounds like a diesel! I put on my steth and almost went deaf! I have never heard an injector so loud. he said it started doing this when the truck had 25,000 miles on it and Ford couldnt fix the issue. solve this one and I'll have a customer for life.
