They are cast the same as the older blocks and just not machined at that location, there is no freeze plug. In theory you could drill/mill the area out and run an oem type setup on those blocks. I think the hole on the oem is like 34mm or something like that.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.