Darren Gurrola, aka DRD racing heads, has come up with a big block case for a Type 1 based engine. http://www.drdracingheads.com/catalog/product_info.php?cPath=92&products_id=220 He says that you can put in 106mm pistons with a 90mm stroke crank! That works out to 3177cc's. I can't even friggin imagine! Gives me goosebumps just thinking about it.