They show 2 different CNC ported heads "machined for 2.18 intake and 1.81 exhaust" valves, but then the two different part numbers are listed as either:
P4876382- flat tappet cam(lifts up to .650)
P4876383- roller tappet cam(lifts over .600)
With a foot note stating that MW heads require offset pushrods.
If I had to guess....... I'd say the description of those two part numbers is incorrect.
I think they are bare heads and that one was std port and the other MW port.
(I realize these two numbers at one point were used for the Chapman heads, but I didn't think had arrived on the scene yet in 2001)
Right; They were released in 2003... just in time for Steve Dulcich to get a set for that year's Engine Masters event (
after the Moparts.com team had been told they wouldn't be legal, IIRC).
Oh, I had (have?) the flow #s for the Moparts EMC Stage VI heads... somewhere. Best as I can recall, they peaked about 345 on the intakes, pretty much what you said.
