How do you tell the difference between a 390 and a 428?
How do you tell the difference between a 390 and a 428? Registered. Yes sir , the only way to tell the difference between a 390 & a 428 with the engine setting in the car is looking at the balancer .. A 428 is externally balanced and has a larger harmonic balancer .. The parts numbers on the heads will tell the type heads . Can you change firing order on Fe 390? If you need to rotate the cap for any reason don't worry about pulling the wires and rotating them around. Again this is OK as long...