Maybe a trip to Larry's is in order so he can show you for yourself. Machine shops have been known to exagerate a bit about some things in order to get more work and more money. And .0015 taper on a lifter body? OMG, that thing will spew chunks everywhere. 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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