Running twin hitachi carbies on the l 18 . What to do with tappet cover breather and the breather on the side of the block .Running sports cleaners on the carbies don't what to run the original air cleaner When I got the motor it had foam straped around them MMM???

oil catch can breather set up would be the go. There should be a PCV inlet valve on the su manifold

The breather system is the opposite of a regular A12. The twin carb system is:
* Rocker cover to PCV valve
* Block breather to air cleaner

You can buy small rocker cover breathers from places such as pabs or bursons, all you need to do is measure the breather pipe size.
I run one on each of my A series motors, as I have a weber carby on both my 120y coupe's, which have sports air cleaners.

Cheers.

Doesn't the l series motors blow out of the tappet cover it would be blowing into the filter wouldn't it

shouldnt really be blowing out the rocker cover breather as such, there will be a small amount of air pushed out as the engines running
but if excessive amounts of air/smoke are coming out then you have a blow by issue

no it runs very clean mate just a wisper of air is blowing out tappet cover

in the past i have put a little K&N filter on the breather on the tappet cover, but apparently thats illegal, the catch can option is the way to go, thats not illegal.

it is if it vents to the atmosphere, legally has to go back into the induction system to be burnt up by the combustion cycle once again.