[turbo69bird]

Originally Posted by Vckline313

I had the exact same problem and tried EVERYTHING from water wetters buying new radiators and different fans messing with the timing new hoses etc. Nothing worked untill I put in a properly clearanced flow Kooler pump

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Ahh you know what I forgot that was also a change I'd made where I took the pump off and bent the divider plate to meet a certain depth from the impeller. Was so long ago I'd forgotten that.
Figured I'd add that because now I remember I'd made that change. Other was my hose collapsing which wasn't an issue at first w new hoses but as they got older they started collapsing only under higher rpms.

Glad you got it sorted out, now when I build my new motor I'll check that clearance for the plate.