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thermostat by pass has frost plug in. i need both sides of this argument please.

Am into engine rebuild, few tweeks here and there will post when done.
but please can i have some info.
there is a frost plug in the thermostat by pass tube. i remember something about this from years ago. was this because there was problems soucing the correct thermostats or for some reason.
can i have relivant information as to the pros and cons of this or should i go back to standard.
I have a new high flow, cleavland waterpump which has the bypass tube.

ok alittle more info.

have checked old forum posts and a brass bypass restrictor is mentioned and shown for sale by Marlin. why the restrictor? the frost plug in my block looks about the size of the hole in the centre of the brass bypass restrictor. this is bassed on photo of restrictor.'
if more info is needed ill get a photo tomorrow.

any help on this is much appreciated. thanks.


cj
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