you didn`t give a lot of specifics on the hemi engine. having owned 2 of them myself, that is not enough carb to feed it if it`s healthy. my bone stock one went 12.90`s at tulsa when tuned right, on the old -slick track.(had 2" headers on it tho) fuel delivery is big, and u may be on to something w/ the air cleaner deal. just sayin that is awful for an elephant motor .--------------------bob:coffee2: