phosphate-free
a 912 Porsche engine will fit in a beetle
It depends what type of Corvette vs. what type of Porsche. Certain Corvettes are faster than certain Porsches and vice versa.
The 2014 Porsche Panamera has double overhead cam (DOHC).
The 2006 Porsche Cayenne has double overhead cam (DOHC).
The 2011 Porsche Panamera has double overhead cam (DOHC).
The 2003 Porsche Boxster has double overhead cam (DOHC).
The 2012 Porsche Cayman has double overhead cam (DOHC).
The 2013 Porsche Boxster has double overhead cam (DOHC).
The 2008 Porsche Cayman has double overhead cam (DOHC).
The 2002 Porsche Boxster has double overhead cam (DOHC).
The 2006 Porsche Boxster has double overhead cam (DOHC).
The 2012 Porsche Cayenne has double overhead cam (DOHC).