Re: 906 TEMPLATE
[Re: A/MP]
#2308279
05/21/17 12:53 AM
05/21/17 12:53 AM
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Joined: Dec 2010
Posts: 1,035 Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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Parksr5 is correct. Dave will set them up with whatever spring you need. Mine look and perform great. I must say the only reason am running antique iron 906s on my ride is that the rules dictate that is what I must run. If I could run something else I definitely would. Seems like MM was in the $2500 range when I talked to Eric about them last year fwiw.
392 gen III hemi on E-85 727 trans Dana 60 10.02@134
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Re: 906 TEMPLATE
[Re: A/MP]
#2308309
05/21/17 02:11 AM
05/21/17 02:11 AM
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Joined: Mar 2017
Posts: 43 California USA
LowDeck451
member
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member
Joined: Mar 2017
Posts: 43
California USA
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Waiting for confirmation, but Muscle Motors is supposed to have a CNC program for the 906 head. The bottom will still be $ vs reasonable results. FWIW, I saw an article in a Mopar magazine about that 906 CNC service, had to be at least 4 years ago. Out of curiosity I called MM for pricing, they told me it was $2200, with customer cores.
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Re: 906 TEMPLATE
[Re: A/MP]
#2308345
05/21/17 05:30 AM
05/21/17 05:30 AM
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Joined: Jan 2003
Posts: 1,361 Wild West
M_D
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,361
Wild West
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Under optimum machining conditions aluminum removal rates would be much higher than cast iron, but the porting cutters and even the CNC porting machines capabilities can be factors in maximum cutting feed rates as much as the material being machined.
Three dimensional contouring of a port or something similar necessitates constant changes in directions. The ability of a CNC machine to process the code and the ability of the machines axis motors, software and hardware to accurately follow the programed tool paths often limit the highest practical feed rate, rather than the material being cut. The moving parts on the CNCs can only accelerate so fast in a short distance, and with the need to slow down for corners, then accelerate again, and slow down again feed rates are limited. So what is doable for actual feed rates for longer straight or gently curved paths is not obtainable for this type of machining. One way to visualize this is CNC tool paths are a lot like race tracks, short straight stretches with tight corners slow things down, even if the car could theoretically go faster.
On factory iron heads I doubt depth of cut is very deep over the majority of the port surface which would further speed things up and the feed rates probably can be run closer to aluminum than one might imagine.
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Re: 906 TEMPLATE
[Re: A/MP]
#2308418
05/21/17 12:15 PM
05/21/17 12:15 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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Thanks for clearing that up Mike!!
Sounds like you're saying it probably doesn't take much, if any, more time to CNC an iron head over an aluminum head.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 TEMPLATE
[Re: fast68plymouth]
#2308445
05/21/17 01:01 PM
05/21/17 01:01 PM
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Joined: Nov 2003
Posts: 2,131 New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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Last one.....
A- "Ported" 906 head, SI brand 2.14 valve, no back cut, valve job done with a radius for bottom angle. Pinch opened to 1.070, guide boss trimmed a bit, some short turn work. Didn't look too bad, and actually didnt work that bad in the upper mid-lift compared to a lot of what I see of these things.
B- open bowl more, relieve chamber adjacent to valve, longer top angle on valve job, a little more work on the guide boss, lay back the short turn, back cut valve...... Same cylinder as above
Lift-------A/B .100---70.4/71.6 .200--124.4/156.6 .300--180.5/217.1 .400--229.4/255.1 .450--241.9/257.7 .500--243.8/258.9 .550--248.3/259.7 .600--248.3/258.9 .650--234.3/258.9 .700--234.3/259.7
The newer heads??? 902 head(1974): A- OE valve with back cut, grind 3 angle seat, less than 10 minute blend
B- open bowl a little more, bullet nose guide boss, pinch to 1.025", Manley valve with back cut
Lift--------A/B .100---67.2/ 70.4 .200--139.0/142.0 .300--202.5/205.4 .400--230.5/244.5 .450--237.0/249.4 .500--240.7/254.0 .550--243.8/257.0 .600--245.7/253.2 Wow I bet the customer could FEEL the difference on that swap! That might pick up 1 second? I used the templates on some 906s on my Super Bee. HMMMMM they might still be on that 440, 10:1 slightly bigger than stock cam (.468")? headers and six pack 12.18 with slicks 3780 #s with me in it. Don
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Re: 906 TEMPLATE
[Re: fast68plymouth]
#2308909
05/22/17 02:54 AM
05/22/17 02:54 AM
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Joined: Jan 2003
Posts: 1,361 Wild West
M_D
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,361
Wild West
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Thanks for clearing that up Mike!!
Sounds like you're saying it probably doesn't take much, if any, more time to CNC an iron head over an aluminum head. That's my best guess. I'm not not sure how many tons of metal we have cut with out CNCs, hundreds I would guess. I haven't done any full CNC head porting, but it's similar enough to other 3D surfacing like molds and stuff that I think my estimate is probably correct. One think I know for certain is I hate machining cast iron, it makes a nasty mess, it's a lot like dirt or mud when you do a lot of it and the coolant washes it around in the machines. If you cut it dry then its like dusty dirt.
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