Cooling system on 371 1957

[Guest Two Roadmasters]

Hello,

I am helping a friend restoring his Super 88 and now when we deal with the engine we see some things that we hope to get some answers on. Upon checking the 371 block we see what we think is reduction rings in some cooling channels as well as channels that seem totally plugged. Does anyone in this forum know if some of the cooling channels should have these reduction rings and plugging and if so, is there some kind of logical pattern that is used for the purpose.

Thanks for any input.

Mats Ahrin