I've got a little '23 T with a fresh 350 that's beautifully set up, strong, fast, smooth and all, but there's one little thing. As it hits 55-60 mph, the load drops off, the vacuum comes up, and it gets a very light valve rattle until over 60 when the aero load increases and it goes away. I have been from one end to the other with initial advance, cent. adv. and vac adv., lifters from loose to tight, higher octane gas, and nothing makes it go away. It's clearly not hurting the engine or affecting performance, just frustrating. I'm sure the big engine/little car thing has a lot to do with it. Any ideas? Specs follow to keep post short.
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