My 440 died yesterday, and I would like to avoid throwing parts at it

Bill Crowell said
This old 440 in my D-300 Adventurer SE has been back together for some time now with a new timing set, and is running like a champ! It's a '78 model, and the heads have never been removed.
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What made you decide to remove the timing cover??? Or did you just do it because that's what you suspected??