Originally Posted by
gearhed1971
Is there any real difference between 2V and 4V heads? I was told that it was just for numbers match ,but how do the ports match?
There are no VIN's or serial numbers on Ford mechanical parts.
Numbers matching is a GM thing.
There were no 351M (1975/82) or 400 (1971/82) 4V heads installed on US/Canadian assembled cars/trucks.
The only carb available with these engines was the 2V.