Quote:
Originally Posted by estout81
And don't drill holes in them!
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Respectfully, why not?
A couple small holes let some water through while the engine is warming up to thermostat opening temp. Particularly on the 59a/b blocks the thermostat is far enough from the water in the head that with no circulation the temp sender in the head will go to 200+ before the water touching the thermostats gets up to 180. No great harm except it gets you in the habit of ignoring an overheat indication. The miniscule flow through those holes will not significantly slow how fast the engine warms up.