Scott Duggins started building car engines in 1984 alongside his father. They worked together offering a mix of engine rebuilds and overhauls for their customers' daily drivers as well as supplying ...

Mercury Racing / Roadster Shop SB4 7.0 - DOHC 32 Valve engine based on LS7 makes 750 hp at 8,000 rpm! A look at the new SB$ DOHC LS-based engine designed by Mercury Racing and brought to the ...