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Flow numbers for stock 5.3 heads?

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Old Dec 27, 2003 | 11:47 PM
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Default Flow numbers for stock 5.3 heads?

Does anyone have the numbers for these heads from .200-.500, .550, .600, .650 for intake and exhaust?

I am sure this has been asked 100 times before so if so please scold me and swear me down with powerful oaths!
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Old Dec 28, 2003 | 12:45 AM
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I attached stock flow numbers for the LS1, LS6, 5.3l, and 6.0l heads. I flowed these on Thunder Racing's Superflow 1020 bench.
Attached Thumbnails Flow numbers for stock 5.3 heads?-stockls1.jpg   Flow numbers for stock 5.3 heads?-stockls6.jpg   Flow numbers for stock 5.3 heads?-stock53.jpg   Flow numbers for stock 5.3 heads?-stock60.jpg  

Last edited by Jason99T/A; Dec 28, 2003 at 03:19 AM.
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Old Dec 28, 2003 | 12:57 AM
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Great info!! I was looking for this myself.
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Old Dec 28, 2003 | 01:00 AM
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Originally Posted by Jason99T/A
I attached stock flow numbers for the LS1, LS6, 5.3l, and 6.0l heads. I flowed these Thunder Racing's Superflow 1020 bench.
The links didn't work. I am sending you a PM w/ my email addy.
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Old Dec 28, 2003 | 03:20 AM
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The links work fine for me. Either way, I'll send those numbers over to you.

Jason
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Old Dec 28, 2003 | 04:06 AM
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you the man jason
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Old Dec 28, 2003 | 07:23 AM
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The stock ls6 flow better than i thought
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Old Dec 28, 2003 | 08:13 PM
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good info
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Merry christmas!

It messed with me a little bit starting the LS6 at a different lift and throwing that .575 number in the 6.0, but this makes it a little easier to compare.
Attached Thumbnails Flow numbers for stock 5.3 heads?-flow.jpg  
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Old Dec 29, 2003 | 12:41 PM
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Something is wrong here...
Check out 5.3 vs 5.7 intake flow #'s...
The #'s in the charts show that the 5.3 with 1.89
valve is better than the 5.7 with 2.00 valve ????

Dave
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