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426 hemi dual plug heads p4120960 #2550360
09/15/18 04:38 PM
09/15/18 04:38 PM
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st.louis,mo.
69b1dart Offline OP
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cant find this number anywhere on the web,can someone id these heads,numbers on them are p4120960,426 hemi dual plug

Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550445
09/15/18 09:21 PM
09/15/18 09:21 PM
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Posts: 1,969
Stuttgart, Arkansas
rickseeman Offline
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Dart


2011 Drag Pak Challenger
Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550541
09/16/18 06:50 AM
09/16/18 06:50 AM
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st.louis,mo.
69b1dart Offline OP
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thanks rick

Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550569
09/16/18 10:36 AM
09/16/18 10:36 AM
Joined: Dec 2007
Posts: 12,171
Great Neck,LI,new york
hemi-itis Offline
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These are dart castings from the late 70's early 80's.Do yours look like these?

DSC00706r2.jpgDSC00709.JPG2r.JPGDSC00709.JPG2r.JPGDSC00709r3.jpg

HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs
Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550574
09/16/18 10:42 AM
09/16/18 10:42 AM
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Great Neck,LI,new york
hemi-itis Offline
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Had mine on a shelf in the garage for over 25 years.Finally put them on last year!

3.6.17 006.jpg2.13.17 003.jpg3.23.17 017.jpg7.18.17 019.jpg

HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs
Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550576
09/16/18 10:50 AM
09/16/18 10:50 AM
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Monrovia, So-Cal, USA
racerhog Offline
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That looks Sweet Hemi-itis... smile


Bob(Cowboy)Hogan
Monrovia So-Cal
Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550596
09/16/18 11:52 AM
09/16/18 11:52 AM
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Michigan
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Transman Offline
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Hemi-itis - have any flow numbers from yours ?

Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2550666
09/16/18 03:25 PM
09/16/18 03:25 PM
Joined: Dec 2007
Posts: 12,171
Great Neck,LI,new york
hemi-itis Offline
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Never had them flowed,Might be able to get them from Steve Sanchez.
That are fueler heads from back in the day........
They work GREAT! smoke


HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs
Re: 426 hemi dual plug heads p4120960 [Re: rickseeman] #2729850
01/03/20 09:58 PM
01/03/20 09:58 PM
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florida usa
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cudame Offline
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I THOUGHT THEY DIDN'T MAKE DART HEADS SOMEONE TOLD ME THAT ARE YOU SURE

Re: 426 hemi dual plug heads p4120960 [Re: cudame] #2729884
01/04/20 04:40 AM
01/04/20 04:40 AM
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st.louis,mo.
69b1dart Offline OP
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i have dart heads on this motor,looking for dual plug mullens heads

0103201055-00.jpg
Re: 426 hemi dual plug heads p4120960 [Re: cudame] #2730002
01/04/20 01:32 PM
01/04/20 01:32 PM
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Bend,OR USA
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Some body misinformed you on Dart not having their own aluminum hemi head castings, it wouldn't surprise me that they had more than one dual plug casting number heads also shruggy scope
I assembled a blown street hemi motor for a customer in SO CA back in the mid 1990s that had a set of those heads, his family owned several Dodge dealerships and furnished all the parts, he bought those heads form Direct Connection along with a KB street hemi block shruggy

Last edited by Cab_Burge; 01/04/20 01:35 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 426 hemi dual plug heads p4120960 [Re: cudame] #2730150
01/04/20 11:27 PM
01/04/20 11:27 PM
Joined: Jan 2012
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Stuttgart, Arkansas
rickseeman Offline
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Originally Posted by cudame
I THOUGHT THEY DIDN'T MAKE DART HEADS SOMEONE TOLD ME THAT ARE YOU SURE


Come on dude. They were even in the MP catalog.


2011 Drag Pak Challenger
Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2730152
01/04/20 11:35 PM
01/04/20 11:35 PM
Joined: Jan 2012
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Stuttgart, Arkansas
rickseeman Offline
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Originally Posted by 69b1dart
i have dart heads on this motor,looking for dual plug mullens heads


I assume you mean 433 heads? AKA twin plug heads, AKA replacement heads, AKA Ross Foundry heads. Mullens was a head porting shop. They ported most of the top hemi heads for a long time. I feel you will make more power with the heads they make today.


2011 Drag Pak Challenger
Re: 426 hemi dual plug heads p4120960 [Re: rickseeman] #2730169
01/05/20 02:26 AM
01/05/20 02:26 AM
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Bend,OR USA
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Originally Posted by rickseeman
Originally Posted by 69b1dart
i have dart heads on this motor,looking for dual plug mullens heads


I assume you mean 433 heads? AKA twin plug heads, AKA replacement heads, AKA Ross Foundry heads. Mullens was a head porting shop. They ported most of the top hemi heads for a long time. I feel you will make more power with the heads they make today.
iagree up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 426 hemi dual plug heads p4120960 [Re: Cab_Burge] #2730171
01/05/20 02:38 AM
01/05/20 02:38 AM
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st.louis,mo.
69b1dart Offline OP
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hemi -itis,same heads as mine,has total flow on them,after i look them up,says dart made them,thats what i have,but on my header flange can only get 4 bolts to line up in them,im sure its a old fuel heads,they work though ,there not like the 433 heads

Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2730293
01/05/20 01:35 PM
01/05/20 01:35 PM
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One set of heads I've used from Dart where the D4 heads, I was not impress with the results on that motor with those heads down
I don't remember the casting numbers now, sorry blush


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 426 hemi dual plug heads p4120960 [Re: 69b1dart] #2730537
01/06/20 12:17 PM
01/06/20 12:17 PM
Joined: Dec 2007
Posts: 12,171
Great Neck,LI,new york
hemi-itis Offline
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Originally Posted by 69b1dart
hemi -itis,same heads as mine,has total flow on them,after i look them up,says dart made them,thats what i have,but on my header flange can only get 4 bolts to line up in them,im sure its a old fuel heads,they work though ,there not like the 433 heads


I was able to port the large header flange to make them work.The exaust port only uses half of the port on the flanges.They also showed a little daylight on the top of the port flang requiring adding some material on the exterior top of the tube to flange. Not sure if it effects my performance but I have to work with what I have. As much as I would like a new set of headers it's just not in the very limited budget.
I do have an issue getting the flanges to seal well on the heads.

3.23.17 017.jpg6.1.17 068.jpg3.23.17 018.jpg
Last edited by hemi-itis; 01/06/20 12:20 PM.

HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs
Re: 426 hemi dual plug heads p4120960 [Re: Cab_Burge] #2730789
01/07/20 12:16 PM
01/07/20 12:16 PM
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Originally Posted by Cab_Burge
One set of heads I've used from Dart where the D4 heads, I was not impress with the results on that motor with those heads down
I don't remember the casting numbers now, sorry blush


The D-4 heads were cast iron, raised exhaust port and for NASCAR racing. I think the nitro monkeys used them in the 1970s as well.


Floyd Lippencott IV
Re: 426 hemi dual plug heads p4120960 [Re: mr_340] #2730902
01/07/20 07:00 PM
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Originally Posted by mr_340
Originally Posted by Cab_Burge
One set of heads I've used from Dart where the D4 heads, I was not impress with the results on that motor with those heads down
I don't remember the casting numbers now, sorry blush


The D-4 heads were cast iron, raised exhaust port and for NASCAR racing. I think the nitro monkeys used them in the 1970s as well.

I was told by the owner that they where D-4 heads confused, They were aluminum and had a raised exhaust port that was about half the size of a street hemi exhaust port. I wonder if they could have been the later D6 heads for Pro Stock? confused His family owned several Chrysler, Dodge and Plymouth dealer ships in SO CA in the 1960s up to 2000 or so shruggy
I got lucky to be picked to assemble and dyno test that motor wrench grin

Last edited by Cab_Burge; 01/07/20 07:01 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 426 hemi dual plug heads p4120960 [Re: Cab_Burge] #2730952
01/07/20 09:50 PM
01/07/20 09:50 PM
Joined: Jan 2012
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Stuttgart, Arkansas
rickseeman Offline
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Could have been D-6's. They look like D-4's but are aluminum and have twin plugs. Or they could have been Darts like you first spoke of, that had been ported to D-4 specs. That was a popular exhaust port at the time.


2011 Drag Pak Challenger
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