Aluminum cylinder heads, fuel rails, multi port injection, and intake I would think are the biggest differences I can think of, it is a gen 2 block which is similar but still different then the gen 1 tbi block. They used a northstar ignition system which ditches the problematic optispark used in cars. they run more compression due to the reverse flow cooling design. These engines can really wake up with a cam and pushrod/spring upgrade. I'm sure someone has a stroked one out there with a supercharger
