Hydraulic Lifters and Valve Train Rattle

[Don Gallimore <dongallimore@xxxxxxx>]

Earlier this year, I installed a new Comp Cams Hydraulic Lifter Cam with 
440Source roller rockers. Now that I've run it a few miles (Carlisle and 
back), I adjusted the lifters and quickly change the oil and filter on 
my 440.

When I started it, the oil pressure took a while to build up (need to 
fill the oil filter, I guess), but took a lot longer than I would have 
expected. Once I had oil pressure and started it, the rocker train was 
rattling pretty hard.  After putting an automotive stethoscope to the 
valve covers, found it was the right side valve train. So, shut down the 
motor, pulled the valve cover but found no problems.  Did no lash 
adjustment, just put the valve cover back on.

No noise now?  Huh? Make any sense?

While we're at it, Comp Cam said to adjust the rocker until it contacts 
the push rod then give it a half turn more for preload.  The studs are 
20tpi so a half tune is 0.025 preload.  Sound right for preload?  I did 
notice when I pulled the valve covers for the above problem I could turn 
the pushrods on the closed valves by hand.

 Akron Don


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