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He spec'd a 10-71 on this 505" engine. So, based on that, I wouldn't think that a 6-71 would be too bad on a non-race 426.

Don't the 10-71s have a bigger base than the 6-71? Are there intakes still out there for the different blower bases?

http://www.goodvibesracing.com/

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Speaking from just a little experience, piecing a blown hemi motor together has proven very costly many a $$ wasted. I had Dan (performance only) doing the build and even discussed with him before buying parts and when he received them I know he didn't even bother looking at them because they turned out be sh!!t or the wrong part. I have bought parts from members that turned out to be sh!t and am not in a position to argue because Dan is gone. I bought a used blower and was told it was great and everything was redone, had it shipped to Littlefield and turned out it needed a new snout, restripping and a few other things. If you are a newbie like me save yourself the grief and a lot of money and just deal with a reputable builder as close to you as possible, even if it's just for buying the parts but be careful because even with a builder you can still be taken for a fool.

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Agree and the few that run em seem WAY slower than they should be especially when little wedge`s can out run em............just statin the facts.

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He spec'd a 10-71 on this 505" engine. So, based on that, I wouldn't think that a 6-71 would be too bad on a non-race 426.

Don't the 10-71s have a bigger base than the 6-71? Are there intakes still out there for the different blower bases?

http://www.goodvibesracing.com/

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Just an FYI, in the original Detroit Diesel terminology the 6-71 blower sizing referred to 6 cylinders displacing 71 cubic inches per cylinder per revolution, oddly enough exactly 426 inches. Not an exact science for sure, but a decent 6-71 would be more than adequate for a streetable setup on gas without a lot of overdrive. The stud pattern on the manifolds are all the same from 6-71's to 14's. The openings are the difference with the larger blowers obviously having longer openings, at least on the older standard helix blowers. On the top side, the bolt spacing front to back on the 6's and 8's is 13.25" and on 10's through 14-71's the bolt spacing is 15.25" so you have to take that into account when you shop for a carb spacer.

X2 on GoodVibrations, also you might look at www.RBSSuperchargers.com

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I am NO expert,but I did stay in a holiday inn once
My 545 stock iron headed hemi made a little over 900hp with 10 lbs of boost.

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If you where runnng the pulleys like mark on the top of that sheet I would say it was 19.4 % underdriven which would make since with 4 lbs of boost like marked on the top of that sheet The last 426 Street Hemi motor(484 C.I. I think, 4.25 bore with 4.375 stroke ))I built and dyno tested made 7.0 lbs boost at 7300 RPM with 12 % undrive pulleys on it and it made 924 HP at 7300 RPM with a 10:71 Littlefield street blower and two 1150 Carb Shop blower Dominator carbs using CA pump swill with 33 degrees total timing. We swapped the pulleys (to 13% overdrive)and dyno it with VP C12 race gas and the motor made 1027 HP at 6500 RPM with 25 degrees total timing making 12 lbs of boost, it started to detonate after 6500 RPM so we stop the pull The manifold inlet temps where getting hotter also with the increase amount blower speed and boost I ended up swapping the pulleys back to 12 % underdrive and told the customer to get good at handling that amout of power in his car and when he got another set of wheels and real race tires( his car had a set of M/T 17x29x15 Sportman Pro on 15 inch wide wheels then ) it to call me to hop it up more later. He sold the car before getting the motor running in the car That orange 1971 Cuda ended up being featured in one of the smaller Mopar related magazines, A chef in Plam Springs ,CA bought it and had someone else finish the car according to the magazine article. I talked to the original owner after he sent me a copy of that magazine and ask him about the changes to his old motor, he said there was no changes to the motor, it was installed and ran as it was the day it came off the dyno the day we dyno tested it Hemi motors need air and fuel to make power, more air and fuel makes more power

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Think it says 4psi...
Curt

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Thats right Curt,that was 4 lbs on pump junk.
Here's the 10 pounder

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And one of my customers with his beautiful Challenger.

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Challenger?

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And one of my customers with his beautiful Challenger.

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Ummmm, no.

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Well THAT'S embarrassing. Maybe I had too much coffee today. His race team is even called "Team Cuda". I need a drink!

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I'm glad it is you on posting the wrong car picure and not my memory again I need my old memory back, not the defective one I have now