Spoke with the machine shop today about the roller lifter kit vs the "flat tappet" lifter kit.
Aside: the lifters are the metal bits that contact the cam directly.
The traditional flat (no-moving parts) cam kit is $180. The rolling kit is $1000.
Needless to say, I went with the traditional flat ones.
Here's a picture to illustrate the difference.
Good call, less moving parts = less things that could possible go wrong. Although, if your goal was to increase your chances of catastrophic failure and spend more money; bad call.
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