Morris Minor Owners Club

Well mine certainly doesn't have that! Nor has it twin carbs for that matter. It's a 1098 block which someone has stupidly added a 948 head to, and has the standard (rubbish) breathing arrangement.

Is there any reason why the dizzy advance inlet in the carb spacer posted by Declan earlier couldn't be used as a crankcase breather? BMC, you seem to think it won't work...

If it would work, it seems to be the cheapest/easiest solution. Just need to figure out where to get a hose with one huge end and one tiny end!

It's too small to be effective - but if you can bore it out to say 2mm - that would be ok. Your 1098 engine will be horribly strangled by a 948 head - you should urgently look for a better head for it - I can thoroughly recommend the 12G 940 head.....