Mercury Racing has partnered with Roadster Shop to bring the revolutionary SB4 DOHC engine to the custom car market. Based on the GM LS7 engine block, Mercury has developed a dual over head cam, 4 valve head to take the LS platform to the next level. The 4 valve head allows for significantly improved intake and exhaust port flow over the traditional 2 valve design, resulting in improved drivability, idle quality, and most importantly a package that revs to 8,000 RPM making 750 HP.

Horsepower: 750 @ 8000
Displacement (L/Cid):  7.0/428
Bore (MM/IN): 104.775/4.125
Stroke (MM/IN): 101.60/4.00
Compression Ratio: 11.7:1
Cylinder Arrangement: V8
Alternator (Amp/Watt): 165/2327
Controller: Mercury PCM
Fuel System: Sequential EFI
Warranty: 12 Month Limited