I know the flat height adjuster won't allow the 8 inch wheels, I have to modify them to clear the wheel. If you have just swapped a PT onto another Victa base then they are the same height, unless you have swapped a standard PT on to a Tornado base because the Tornado base is 20mm higher but it is also a bigger cut. If you have swapped a standard PT base for a standard PT base then your blade carrier height will be exactly the same, only difference is the height adjuster