Having read your other post i tend to agree that your problem has probably occurred largely due to oil starvation...
Using a Motorcycle engine in any type of car application will result in some headaches one of which is Oil starvation through centrifugal forces acting on the oil in the oil pan forcing it towards the sides of the oil pan allowing the oil pump to cavitate, This might only happen momentarily but over prolonged occurrence can lead to engine damage..
When you install a bike engine in a car you really need to employ a Dry Sump setup which utilises a shallower oil pan and a separate oil pump that delivers your oil feed without compromise to the Lubrication system regardless of centrifugal forces imposed on hard cornering for example..
On the down side these systems are both costly for the enthusiast and limited to the larger sized bike engines such as the ZX12R & Suzi Busa..
You can get a custom one made for your particular engine but a one off will be Telephone numbers and way out of the average Joes paycheck..
Nova in the UK supply Dry Sump systems and can retro fit what they don't have on the shelf..
The link below will illustrate what i am talking about with a Busa System..
Hayabusa Dry Sump Kit - Hayabusa Race Engine parts Turbo Motorcycle and Performance Bike Tuning by Big CC Racing