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I know this has been beat to death but what hydraulic flat tappets are best now. Cam is a Howards 126736-10, .612 lift on both.
You want to run Delphi's only. NOS or if someone has some stock left of OEM GM. I've got a partial tray left of Delphi if you want US made stuff.
 

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I have had luck with howards 91161(gaterman)
In my latest builds I used comp cams short travel 15854-16).
 
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