08-27-2013, 12:14 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Back in the day when these were in OEM applications they weren't getting more than 10,000 miles before the valvetrain would begin making clicking and clacking noises. Many valve jobs done under Ford Factory warranty to remedy the problem. It wasn't until it was found to be the chroming process on the valve stems that was actually the problem. The stems were somewhat rough (you could feel it with a thumbnail). The valve guides were being heavily worn prematurely, causing increased valve guide clearance, which led to unwanted valve train noise. This held true for all the canted valve Fords 351,400,429,460. Took a while for engineers and suppliers to figure it out. It was a pain to face a customer that had bought a new car and had this going on 8 months later 
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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