Just went through this with a friend. Fresh rebuild - same symptoms. The end reasons that we never thought of ended up being the issue... Let me explain...
The Death of the Flat Tappet Engine.
Nearly all current cam / lifter manufactures have conglomerated under Chinese supply umbrellas. No matter (nearly) who you use - the lifters (even in Comp Cam packages) are Chinese made. And they are rarely hardened well enough. Its become a huge issue. Combine this with the industry's scapegoat of claiming it's the inadequate zinc in modern oil.
I've read through most of this - even if a new cam - have you watched rocker movement?
Lifters collapse and over extend - cams wipe in a minute.
The Death of the Flat Tappet Engine.
Nearly all current cam / lifter manufactures have conglomerated under Chinese supply umbrellas. No matter (nearly) who you use - the lifters (even in Comp Cam packages) are Chinese made. And they are rarely hardened well enough. Its become a huge issue. Combine this with the industry's scapegoat of claiming it's the inadequate zinc in modern oil.
I've read through most of this - even if a new cam - have you watched rocker movement?
Lifters collapse and over extend - cams wipe in a minute.
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