Rebuilt LS7 Dyno test. 661 hp at 6,600 rpm and pulls to 7,000 rpm 1:25 Mercury Racing / Roadster Shop SB4 7.0 - DOHC 32 Valve engine based on LS7 makes 750 hp at 8,000 rpm!

By giving the LT2 V-8 in the Stingray new sleeves, a 4.0-inch Callies crank, and 4.125-inch Mahle pistons, the former 376-cubic-inch V-8 is transformed into a 427 like a modern-day LS7.