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Question for the Bosswrench

I recently restricted the lifter bores on my high RPM Cleveland. The oil heats up much too fast, and then the pressure bleeds off. I'm thinking the lifter bores may be to small. How much clearance should there be? My lifters all "feel" free, but with the reduced oil, I'm thinking they are getting hotter and expanding. Several of the lifters show an unusual pattern near the bottom, but are still smooth. What do you think?

Thanks, Dan
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