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Discussion Starter · #1 ·
the 63 is up and running but with a noticable change since breakin. after a few hours on the motor I know have one or several tyapping noises much like a colapsed lifter. everything is brand new. the heads were milled and the crane roller rockers are 1.7 ratio. this coupled with the lift ont he 270 cam could be creating valve clearance problems in one or more cylinders. I can start by shimming the rockers. But why would the tapping start two or three hours after breakin and not be noticable at the start? Any other suggestions?
 

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Before I ran the engine any more, I would drain the oil and cut open the oil filter and check for metal. Possibly a lobe or two wearing off? Better to be safe than worry.

And could be something as simple as the lifters aren't adjusted correctly.
 

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I would look at the valveretainers and make sure they are all properly puit in and holding the valves. Are was tapping and the engine builder thought it would be the lifters...pulled the valve cover and the retainer was about to let go of the valve

Close call there.
 
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