October 9th, 2010, 06:26 PM
I just got a 1969 base cougar that has a m vin code which I understand means a 351w 4v engine. The engine is a 351w with a 2100 2 barrel carb. So does this mean that the carb was swapped at some point or possibly the engine? Is there any way to tell if the engine is original to the car? If this is the original engine would anything else have been modified for the 2v carb that would need to be changed if I go back to a 4v?
October 9th, 2010, 08:27 PM
Is the intake manifold a 2V or is there a 4v to 2V adapter on the 4V manifold ?
October 11th, 2010, 05:33 PM
With the exception of the carb and intake, the 2v and 4v windsors were largely identical. If the intake is of the stock 2v variety, it could be the original motor that some previous owner swapped the intake and carb for better fuel economy.
The only true way to know is to get under the car and look up towards the vin stamp on the back of the block. It is visible from under the car. You can also use a mirror to read the vin on the block from the topside as well, but it can be disorienting.