Beemerboff
Registered user
I'd be having a look at the timing chain.
ps. If you run it with the rocker boxes off, it'll chuck oil everywhere.
Oil drains out when you remove the rocker boxes so it is just a case of leaving the catch pan in place.
Only a small amount drips out in the time it takes to verify everything is working as it should, and it saves wondering.
Next step is pulling the front end off to expose the timing chain, but most folk might prefer to do the simplest things first.