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I am rebuilding a 66 425 and am working on the heads. The guide clearances are in spec as well as valve stem diameters on the original valves. The valve guides look original. Any sure 100% way to tell if they have been replaced? The rocker shafts are worn on the bottom to where there is a...

I am trying to confirm mileage on a 425 nailhead in 66 Riviera GS. The seller stated 27k when I bought the car and I assumed 127k. Much to my disbelief, I started to notice some signs it could actually be 27k despite its neglected condition on the surface and I figured tearing the engine down...