Chrysler had Dragmaster make these 4BBL intakes for the max wedge. I have both and have used both on 452 heads, the 2406185 is on a 440 in my 68 Coronet R/T as we speak. No failure in ten years of running. I also used a factory max wedge cross ram intake on these 452 heads.

On a side note, these 452 heads have been opened up to max wedge size intake and exhaust ports.

This mild 9.? compression ratio 440 runs and performs well with one 4BBL and it will knock out 18+ miles per gallon with the 3.54 gears and the OD 833 4speed.