Thanks Ron - the engine oil had been in for 3 years but just sitting with the occasional start over that time - no issues until the weekend.
Breathers are still open to the atmosphere. I think the oil just pooled on top of the heads.
I will keep the 4.6 thanks - conversion only half done - still running early 90s LPG restrictor system, still on 3.5 carbs and 101 exhaust manifolds and ignition fixed at 10 BTDC - might not be able to develop full horsepower with the engine strangled but it still gets its torque down low - is really noticeable.
Garry

