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Message: [QUOTE="burtco99, post: 1401202, member: 20373"] I recently experienced similar issues on my own truck. during research, I discovered the following: - Installing 6.0 bridges on a 6.4 -- 6.0 bridges are a bit taller. - Installing 6.0 valves in a 6.4 head. 6.0 valves are a bit longer. - Machining too much off the head results in the lifter being compressed further. - Cutting the valve seats too deep ,and compensating with valve spring shims. - New rocker arm pedestals that are shorter than the originals. any of the above errors can result in the valves not closing completely due to the lifter being bottomed out. My own truck suffered the 6.0 bridge mix-up. I accidentally ordered the wrong parts when preparing for a rocker arm replacement. Scratched my head for some time before figuring out the problem. I also discovered that replacement FORD rocker pedestals are not made to the same tight specs as the originals, one set I purchased was 0.018" shorter, while the other set was tapered end to end by 0.010" and was 0.010" shorter. The shorter pedestal will push the lifter plunger further into the lifter, possibly bottoming it out. Since the rocker pedestals are a non-wear item, I recommend you compare originals to the new replacements prior to installing them. [/QUOTE]

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