Most of these suggestions do not address the low flow issue and that is where the effort needs to be concentrated. Stop worrying about the over bore, the fan, the shroud, thermostat and any of that other stuff. Look for the issues that will cause a low flow condition and you'll find your problem.
"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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