does anyone know what size thread this pesky little thing is?

it appears the nipple that goes into the head for the coolant bypass is so corroded on mine, i cannot get enough purchase on it with a hose clamp...

i don't like my fancy new red coolant on the floor

i know it's a contentious issue whether to plug this or not. i'm thinking i'll plug it.

so what size thread is it?

should i use brass or steel plug? does it matter?

cheers.

5/8" UNF. I use steel plugs but I also use a good coolant / inhibitor.

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I make DrMini ST brass adaptors. Never rust out like the originals do.
However if plugging it off, a steel plug will work fine.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

hmmm, i've been wanting some DrMini porn parts on my car for a while now....

Doc, how long is the "barb" for want of a better term, or smooth nipple, on your adaptors?

i'm trying to use a wide clamp on a kevlar hose but my old adaptor does not have enough left in it for the clamp to grab on to....

Doc are yours barbed or have a 'bead' on the end?

Mine are straight, no barbs, I turn them from a BOC gases oxy hose joining nipple. I've never had a leak problem with std rubber 1/2" radiator hose on there.
Length of the straight bit (guess) is around 1/2".

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

hmm i like the idea of using radiator/heater hose, why'd i not think of that before...

pm sent.