Via the vertical pushrod “wells “ on distributor side that go from camshaft tappets /followers to the rocker arms in cylinder head.( you can see this if you take tappet/ pushrod long cover off on distributor tower side.
I’ve an engine in bits atm so will try to send a picture.
There’s also oil return to sump from cylinder head at rear.
The breathing on exhaust side not that great if you use high revs.
Now you know what you are looking for you can just make out the vertical pushrods in your diagram.
Graham
Last edited by flyinghorse1; 09-06-24 at 07:28 AM.
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