All Oz minis had a 1/4 BSP thread in the filter head, regardless of what filter type was fitted.
Mattsmadmini just bought a new spin-on one, and one of my 1/2" hydraulic hose kits. And found my 1/2 BSP x 1/4 BSP hose nipple fell right into it.
Thread in there appears to be an M14 fine thread or something.
I solved the problem by drilling and tapping it out to 5/8-18 UNF, the same as the block fitting.

I am posting this so people can BEWARE, your old Mini oil pipe flare nipple will not fit into these filter heads. Please check thread size before you buy.

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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.

cha....

all is cool now (doc re-machined it to fit)

just installing it now.... looks alright so far...

just a quick question,

with the new spin on head gasket, which way does it go on? with the blue rubbery heat thing to the front? or back?

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

Blue towards filter, but it doesn't really matter.
If I don't have one of these fancy ones I just cut one from gasket material.

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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.