MG
The Classic Marque

Is there a problem with the current offerings? I've never had one fail. I've used both fiber and metal-faced from Moss, and the hi-temp fiber gaskets from FTFU. All have been great for me.

Manley does have good products though, geared toward racing applications.

@Nick & @Guy thanks.

I am still intrigued by the difference between the HS1 and HS2 carbs, the latter having (needing) the connectors for the Y piece?

@Guy, should I be plugging the rocker cover vent/tube then, or connecting it to something ?

Sorry Tim - I missed this one.
My set-up is quirky; the first owner liked little mods like this.
The breather goes to air, with a drain for oil into a catch-pot, and he probably enjoyed getting the bits made up - all because he liked the trumpets instead of filters with the breather connection on the front one.

My engine's probably only done 25,000 miles since it had a rebuilt engine,...

The filler cap sounds ok. The correct one is plastic, and has a filter built in with an air slot under part of the overhanging top. The idea is that it draws air in, but effectively restricts the flow so that the suction from the carbs creates the negative crankcase pressure, whilst still pulling fumes out. Your setup sounds about right except for that open breather pipe.

I made a catch t...

Thanks both for your comments.

@Guy

Lord knows about the oil filler cap, I have a chromed rocker cover with plastic filler cap. The rocker cover has a "vent" pipe to which i have fitted a tube to a filter, so it is open to the air.

I have recently checked and measured dipstick, following on from another topic on this, and it matches in length with the images shown for ot...

For many years the original manifold gaskets have not been available. The only ones available now IMO are poor quality, and prone to leak.
However, Manley Ford has been supplying ones that are as good or better that the original ones!
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1 734 502 2435
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Len

If your engine is sucking oil from the crankcase, then the oil mist lowers the octane of the fuel mixture, so although I had to add a catch tank due to huge oil consumption, I have left it in place.

It's know issue on the modern eco boost engines that as they wear and start to burn oil, the oil mixture pulls down the octane rating and causes detonation in the engine, clearly the eco boost...

The Y branch system to the carbs was the last of a series of different breather systems on these engines. As engines grew in size from 803 up to 1275 the potential crankcase pressure increased, and with it the volume of oil leakage past the rear crankshaft scroll 'seal'. So the breather system design was improved in steps, the aim being not just to breathe out fumes but to actively extract from th...

Excellent recycling, Guy.

Brilliant idea, Guy.
Couldn't get the bonnet to sit down perfectly, but with another half-inch to go, it's definitely going to contact the buffer. At the moment the filter is just clear. If I don't want it to rub when the engine vibrates, I might pinch it at the top end, and get the beautiful assistant to put a couple of stitches in.
Thanks everybody.