[Bruce in southern OH]

Not going to remove engine at this time, told that it was rebuild in late 70's and early 80's. I do have all the old pistons, lifters and boxes of old engine parts. Just in 20's to low 30's here now, I will wait and maybe catch a warmer day before the flush. ( warm day for Ralph)
Might make some blanking plates and put vinegar in block to soak. Hope when engine was done that they cleaned up/out, again not a running hot problem, just parade/idle, think the radiator cleaning and new pumps will cure!! Will catch the material from block when I do flush. Thank you, and as always Merry Christmas to all.