engion below chassis?

[LeonN]

haw much can you get away with? the book says 25mm but could i go to 30mm or maybe even 40? 50? or would that be ridicules and foolish? i understand that the lower you go the moor chance you have of tacking the sump of unexpectedly but i am looking at all the different ways i can grab 5 or 10 mm hear and there to lower the hight of my engine.