Designed for street 413-426-440 c.i.d. Chrysler V8s that measure 8.75" across block. For EGR, #2191 is stock replacement/street legal part for 440 V8s with OEM 4-bbl. carb.; 1972-79. For non-EGR, #2191 is stock replacement/street legal part for 413, 426 (Wedge), 440 V8s with OEM 4-bbl. carb.; 1966-72 (1973 non-CA); except stock equipped EGR. Will not fit 1962-64 Max Wedge heads.