In the early 90's I picked up a used and very nasty but cheap 400 SBC to get a friend's Chevelle running. I was advised by an older gentleman at the auto craft shop (Army base) to use 3 quarts of tranny fluid and 2 quarts of oil and to run the motor for 20 minutes (no load), let it completely cool for several hours, and repeat two more times. So much sludge and crap came out that I had to unclog the drain hole several times with a screwdriver to drain it all out.
That engine was very worn/tired but it was running when I left Ft. Carson to go back to Germany. He was changing plugs all the time because the valve guides were shot but...
Would I do that again today? Hell No but it did work(ish) for what it's worth...
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 Johnny US Army Retired
1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph
1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car.
1980 Formula 350 Pontiac back burner project
1972 LeMans 350 Pontiac
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