Johnsondawg
Well-known member
Working on an EFI 250 project for my 66 Bronco. We started with a junkyard 78 block but just picked up a low mileage 70 block that’s in much better shape. The crankshafts have different casting numbers. I verified that there was indeed a change in 74 (according to tech archives). Does anyone know specifically what the change was? I have been scouring the internet for the answer this evening but so far I’ve not found any information.