Quote: We picked up 30rwhp and 28rwtq from an almost bone stock 392 with only ported 6.4 heads.
6.4 is a good number for hemi's, with the apaches or nor.
Are the 6.4 heads significantly better than the 6.1? How about the Apache?
Stock they flow a little more on the intake side however they a large 2.14 vavlue which should help out low and lift flow numbers over the 6.1 plus the fact the 6.4 has a closed chamber.
