Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: 69four46]
#329646
05/26/09 06:39 PM
05/26/09 06:39 PM
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lewtot184
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Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: lewtot184]
#329647
05/26/09 07:00 PM
05/26/09 07:00 PM
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Joined: Apr 2009
Posts: 122
MOORESVILLE NC
69four46
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Quote:
look like stage 6's.
Do you have any specs on stage 6's? is that the part number for stage 6's?? thanks
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Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: 69four46]
#329648
05/26/09 07:11 PM
05/26/09 07:11 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
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Val-haul-ass... eventually
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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
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Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: 69four46]
#329654
05/27/09 10:55 AM
05/27/09 10:55 AM
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Posts: 75,060
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JohnRR
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Quote:
can anyone make anything out from that part number?? any dealership parts department guys out there?? thanks 
that's a CASTING number , cotact Zippy , he works for MP he can identify them .
Interesting TINY chamber , they will need work no matter what anyone says and they don't flow very well as cast .
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Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: JohnRR]
#329656
05/27/09 11:05 AM
05/27/09 11:05 AM
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Joined: Apr 2009
Posts: 122
MOORESVILLE NC
69four46
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Quote:
Quote:
can anyone make anything out from that part number?? any dealership parts department guys out there?? thanks
that's a CASTING number , cotact Zippy , he works for MP he can identify them .
Interesting TINY chamber , they will need work no matter what anyone says and they don't flow very well as cast .
I sent Zippy a PM, That should be a part number with the "P" in front of it. They do have a casting number if I remeber correctly under where the valve cover goes like most all mopar heads THANKS
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Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: BradH]
#329657
05/27/09 11:10 AM
05/27/09 11:10 AM
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JohnRR
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Quote:
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.
Brad to the rescue , what's so bad about it Brad ? I guess it would be good for someone with a low compression pig that wanted to bump the compression with just a head change  ...
the biggest problem with all the stage 6 heads , other than the chapmans , is some rocket scientist at MP thought it would be a great idea to RAISE the intake port and use the STOCK valve length. 
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Re: I.D. Mopar Aluminum BB cylinder heads please
[Re: BradH]
#329660
05/27/09 12:02 PM
05/27/09 12:02 PM
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Joined: Jan 2003
Posts: 75,060
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JohnRR
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Quote:
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.
Thanks Brad , that makes alot of sense , I guess a person could spend some time OR $$$ to fix the chamber , maybe Morden could CNC that chamber to something better, but WHY ???
As far as reusing your existing vlaves ... , unless the person already had bigger valves installed in their heads that was a stupid idea.
Zippy , it's good to hear that the backaward thinkers , they must have had backgrounds in finanace ??? , have moved on ...
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