Mast Motorsports took their LS7-based Black Label engine, put their LS3 295cc heads on it and tailored the combo for Optima Challenge competition.

Here's a little Hilborn-injected 304ci LS engine with the potential to scream over 9,000 rpm, but the team at Mast Motorsports is holding back the power curve a little to keep the owner a little safer in his Bonnevi