 The 740 series unit used in the three races for which the car was entered in 1967 has a different , lighter , Repco @-@ designed engine block . It also has redesigned cylinder heads which , among other improvements , mean that its exhausts are mounted centrally and do not pass through the spaceframe or rear suspension , unlike those of the 620 series . It produced a maximum of 330 bhp ( 250 kW ) . 
