I finally dyno tested this 505 cid (4.350x4.250) mopar with 440 source heads that I ported. 9.8:1 custom hyd. roller grind using new xfi lobe ported source heads MP dual plane intake 1000HP holley 1 7/8 headers Made 614TQ @3900rpm and 534HP @5200rpm. Idles nice at 850rpm. Here's a link to the porting post I started a few weeks ago and some pics.... https://board.moparts.org/ubbthreads/show...rue#Post4858551
