As I am nursing along a high-mileage motor until replacement block build-up is done, I have been running with zero coolant pressure (two adjoining cylinders are burning antifreeze). Lately, when the engine gets hot, restart cranking is unusually slow (I assume one possible explanation could be coolant incompressibility?). Is this likely an accurate guess?

Even with no radiator pressure, when things get hot it might allow more coolant to seep into the cylinders and accumulate? And yet, cold starts are normal.

Regardless, I won't waste much effort solving what is not a REAL problem with a motor nearing retirement (if starter wear is the culprit, new motor should exhibit same symptom). Just curious about the cause, and wonder if it's common with leaking head gaskets?

6 VOLTS/POS. GRD. NW INDIANA