Can anyone provide me with some info & specs on Mopar Performance part number P4532657 Aluminum cylinder heads?? Any help would be greatly appreciated

look like stage 6's.

It's some Stage VI-type of head, but you don't show the intake port entries that would help to determine which version better.

FWIW, is that a part # or a casting #?

Part #s for Stage VIs I found '96, '99 and '02 MP catalogs and have listed what they offered each of those years. You'll notice they've changed the offerings a bit and there are numerous part number revisions.
1996
Standard, bare-------------------------------4529335
Standard, unmachined guides and seats--------5249051
Ported, assembled, 2.14"---------------------5249113
Ported, assembled, 2.18"---------------------5249523

1999
Standard, bare-------------------------------4529335
Max Wedge port, small chamber, bare----------5249579
"Street" Stage VI, non-raised intake port, bare------4876311
Standard, assembled (500/545 crate engine head)-----4876991
Ported, assembled, 2.14"---------------------4876186
Ported, assembled, 2.18"---------------------5249523
CNC-ported, assembled, 2.18", flat-tappet springs----4876382
CNC-ported, assembled, 2.18", roller cam springs-----4876383

2002
Standard, bare-------------------------------4529335
Standard w/ CNC-machined chamber, unported, bare----4876819
Max Wedge port, small chamber, bare----------5249579
Max Wedge port, standard chamber, bare-------4876818
"Aluminum 383/440" head, non-raised intake port, bare--4876311
Standard, assembled (500/575 crate engine head)----4876991
Ported, assembled, 2.14"---------------------4876186
Ported, assembled, 2.18"---------------------4876187
CNC-ported, assembled, 2.18", flat-tappet springs------4876382
CNC-ported, assembled, 2.18", roller cam springs-------4876383

That is a part number right on the end of the head here are some more photos

Another photo

one more THANKS

Interesting combustion chamber. I don't recall seeing that shape before but it has been years since I owned a set of Stage VI heads.

can anyone make anything out from that part number?? any dealership parts department guys out there?? thanks

And the answer is:
Max Wedge port, small chamber, bare----------5249579

IMO that chamber design SUCKS. Also, those are the heads that require the .485"-offset intake rockers.

Two main issues w/ the chamber design as I see it:
1. Spark plug shrouded badly --> crappy flame propagation
2. Sharp "ledge" where chamber extends out from plug area --> detonation issues

I also believe (based on some tests Dwayne Porter did years ago) that the OOTB chamber design shrounds the valves -- at least the intake -- badly at low lift.

MP thought they were being "trick"... and IMO really missed the mark.

As far as raising the intake port w/ a standard-length valve: the raised port itself is still a good idea. The stock length valve does indeed restrict how much you can rework the port & bowl area below the spring seat. If it's intended to be a "full race" type of head, it's limited by a design intended to leverage existing parts.

Remember that MP tried to market Stage VIs as a simpler and less expensive head upgrade than something like an Indy 440-1 because you could reuse your current valves & rockers.

Answered in PM already, casting number P4532657 is (was) sold as packaged part number P5249579.

Wish I had more information on the history of the Stage VI in general, but unfortunately nobody involved with them is with Mopar any longer.

I don't like the looks of the squared off casting around the spark plug either...no idea what the idea was with that.