V12LS has been developing a 8.5 L V12 using two LS1 V8 engines and now they released a video of it being dyno testing. On a conservative tune and using their stage 2 cam, the engine produced 717 hp at 6,300 rpm and 627 lb-ft of torque at 5,600 rpm. The team was very excited to achieve their goal of 700+ in a streetable engine in their first real test. The best part is V12LS thinks there is still more left in the engine with some intake and exhaust enhancements. You can read more details of the LS1 V12 in our previous article.
Update 6/15/2016 – Interview with one of the builders
Source: Fullboost and V12LS FB page