I built a 361 as well. Had a similar issue. Turns out that the rocker shafts had to be shimmed up to accommodate the new cam. When it idled, it had a mild "Hiss" sound. Dana nailed the problem, I'm thinking.
1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.