Quote:
Originally Posted by mtkawboy
409/425s were turds from the factory because Chevy built them with 2 head gaskets on them to drop the compression. Removing one really brought them to life. That wasnt very well known at the time though or even now..
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The one we bought not only had two head gaskets, but was missing the inner valve springs. It had the rear cam bearing in wrong from the factory, and had been replaced, so it sat in a dealership for 10 years or so, and then in a dealership mechanic's basement for 5-6 more.