To: Bruce Ryan,

The TIO 550 C from a Malibu is the same size and shape as the TIO 550 E and will work in your IV-P. The 550 C is set-up to run 310 HP and you can use it like that or re -set it to give you 350 HP like the 550 E. The TIO 550 C from a Malibu is the engine I have in my Lancair IV-P