My 422 smallblock build

mygasser said

there are readily available water outlet restrictor kits with 'washers' that have different sized holes to let the coolant transfer more or less heat by slowing the flow more or less. here's some examples Water Outlet Restrictors - Free Shipping on Orders Over $99 at Summit Racing
neil.

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Right. Do some research. Slowing the coolant down is WRONG. Always was wrong, and always will be wrong.

All those washers do is dirty up the oil and if the cooling system is correct, they get to temp way too slow, if at all.

Again, the thermostat sets the MINIMUM operating temp. And it’s a necessary evil because it’s a restriction.