351w Spotters Guide | Ford Truck Zone
2016/1/3· Section # 1 - 351W Spotters Guide. How to tell a 351W from a 302 or a 351C: - Nuer of valve cover bolts per head - FE = 5, W = 6, C = 8, M = 8, 335 Series (Big Blocks) = 7. - Thermostat Housing - W = on intake manifold, C = on block. - Fuel Pump - W = bolts on each side of block opening for fuel pump. C = bolts on top and bottom of block opening.