I think they will work for a 440. However, the 906 heads had a revised intake port, that may not be compatible to the early 413, so some port matching may be necessary. Also, I am aftraid that the left carburetor will interfere with the brake booster, at least as far as late 60's Imperials are concerned. D^2 Quoting Kerry Pinkerton <pinkertonk@xxxxxxxxx>: > Rodger, is there any reason a set of cross rams won't fit a 440. If they > fit will they 'work' correctly given the larger displacement? (I'm thinking > yes since they were on 350-426ci) > > KerryP > Patch panels fabricated > Pinkertonk@xxxxxxxxx > dte.net/57imperial > Imperials -- 50 Limo, 57 roadster, 61's, 62, 68 Convert, 73, a 66 300 and a > bunch of lesser marques >