I
think the 400 debuted in 72 with the engine code 'S'. I am 100% certain that my buddy's father had a 72 LTD with the 400. I remember rebuilding that engine at 110k mi and putting on a (this will show how long ago this was) Edelbrock SP2P-2V intake manifold.

That and a Crane economiser cam (double-

)! Anybody else remember those? 'Gas crisis' parts there! They had very small runners for higher velocity and supposedly better economy. It made gobs of low end torque! Just what every land yacht needs!