MSD Cathedral Porting
I'll show you what I have going on and how I am trying to improve on my combo.
Dart 427
PRC 247 64cc
MSD manifold
Martin Smallwood cam
Dynod 577rwhp 540rwtq
108 degree weather 100 percent humidity
I pulled the MSD off to try and pick up a few hp, ive seen 13hp recorded on a Stroker doing so.
While I was porting and measuring I started to notice a few issues. One being bolts loose on diassembly.
But then found some major problems, the runners of course being small for the large 247cc intake runners and the real kicker, the injectors spray pattern hitting the msd runner divider and spraying out of the intake port almost completely.
So here is how I've went about fixing or so improving on my issue.
I also want to note, during tuning we didn't have any issues, now I'm not saying things might not change when we redyno and tune the car with these improvements.





