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http://www.saltflats.com/WOS_2011.htmGo have a look what a N/A 4200 can do... Black Opel Racing car 6666
51 GMC 4.2 turbo
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Did they get their RED HATS?
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Nope.
They missed on Friday 0.1 mph average.... Sat. rain out cancelled.
51 GMC 4.2 turbo
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Is this it? That's f'ing hauling the mail right there.
QUARTER 1st MILE
CAR # NAME/ORGANIZATION DRIVER CLASS SPEED SPEED
6666 KNORR/KINNEY RYLL DICK KNORR E/GMS 191.59062 195.33228
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Even better - they went over 200 mph 4 times and didn’t hurt the motor.
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Hey Marc,
Send me some high res photos, and perhaps some verbage, and I will put you on the front page of the website.
Tim
Tim Tenold
I.I.#498
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Tim,
If you contact Dick Knorr (car owner) he can help with pictures - he's a registered inliner.
Marc
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Zeke, yep look further down the page... The run you listed was a shake down run.
51 GMC 4.2 turbo
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Phonetically spelled my reply is, "FUH-LY-IN!!"
Translation - FLYING!
GEEBUSS!! Those guys are cookin'!!
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The magic to make it happen is the 4200 head... 340CFM intake @ 28" water
240/250 CFM (depends on which head was flowed and the work done)@28" water
51 GMC 4.2 turbo
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Hope to see Dick and the 6666 team at the World Finals.....So Close nd I'd to be there for his red hat..............JD
216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later
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The magic to make it happen is the 4200 head... 340CFM intake @ 28" water
240/250 CFM (depends on which head was flowed and the work done)@28" water
Is the is that 340cfm intake and 240/250cfm exhaust? What lift is that flow happening at? I'm not arguing with you by asking this. I'm just curious.
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Zeke,
Your right - forgot to mention the 240/250 is on the exhaust side..
flows take at 0.500" lift << that about all you can safely get out of the geometry. Some racers go more but they only run 1/4 mile at a time and run on the ragged edge...
51 GMC 4.2 turbo
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Were those numbers generated with port work or stock porting?
Those numbers, ported or unported, are amazing.
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Zeke,
These are ported numbers. The intake requires little work. The exhaust needs 2-3 hours per port depending on which head you start with.
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The magic to make it happen is the 4200 head... 340CFM intake @ 28" water
Bigger valves, how much porting & at this point are the intake ports really thin?
ThanksMBHD
12 port SDS EFI 
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Intake 1 mm bigger valves and take out maybe 0.05" wall material out of the intake port. Remember that each 4200 intake port is 90 to 95% the size of the combined intake port on the 250.... so its already generous.
Last edited by efi-diy; 09/29/11 01:17 AM.
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Do you have the flow numbers for a stock head?
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roughly - don't have the data here...
same lift pressure drop...
intake 270 ish
exhaust 150 ish...
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