Could take a look at the ball end of the pushrod and cup of the rocker arms..
Sometimes they get beat to hell...
The way I go about doing that is to coat the ball with a black marker and without going at a angle spin it in the arm then have a look at the pattern that can be seen on the ball....Or take a bore scope for a really good look see ...
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A word about B-M-O lifters.....
They have the ability to oil the top end from the pushrods just like the EVO's does..
Would need to change the rocker arms for the oiling ports to support this feature...
After/Market makes the arms for the STD Shovel in the 1:43 or 1:50 ratio or you can cut down the EVO arms to the Shovel specks and have a 1:625 ratio (More lift at the valve with any cam)
Also the lifter blocks can be had in the Evo angles for running EVO cams...Outside still has the looks of OEM Shovel blocks
If you did go with the Tall ratio of the EVO's...I would suggest packing the valve springs for the added lift...And of course Valve to Valve check...
About .080 will need to come off the spring side of the arms to fit Shovel boxes...
And if your heads have been decked or high dome pistons are in the mix...A Valve to Piston check would also be a grand idea to do...
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After you do the check with the hyd. running on the bottom of the working zone of the lifter and the noise is still there.....
Could take a look at the tappet rollers...Very hard to point a finger at the source of valve train noise cause for the sound travels....Kinda like those dang Goats on top of that roof...
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