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Thread: Chevy head flow data
          
   
   

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  1. 02-06-2007 09:13 PM #1
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    techinspector1
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    Chevy head flow data

     



    This is the most information I've ever seen in one place about head flow for the small and big block Chevy motors.....
    http://racingfeed.com/downloads/chevy_flow_data.pdf
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  3. 02-06-2007 11:08 PM #2
    facemelter
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    thanks this helps me out a lot
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  4. 02-07-2007 01:47 AM #3
    jimmyjeep
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    Thanks, I guess my 462 heads dont look so bad after all. Especially with the 2.02's installed.
    Last edited by jimmyjeep; 02-08-2007 at 04:47 PM.
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  5. 02-07-2007 05:28 PM #4
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    Quote Originally Posted by techinspector1
    This is the most information I've ever seen in one place about head flow for the small and big block Chevy motors.....
    http://racingfeed.com/downloads/chevy_flow_data.pdf
    Those numbers are from Stan Weiss,he also shows other head flow numbers from Ford,Mopar etc.
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  6. 02-07-2007 06:06 PM #5
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    I having trouble interpreting the chart.
    Would someone please explain the values in columns ".100, .200 . . . Average"?
    The green percentage must be the resulting volumetric efficiency?
    Last edited by SBC; 02-07-2007 at 06:10 PM.
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  7. 02-07-2007 07:36 PM #6
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    0.100" valve lift, 0.200" valve lift, etc. Using 0.400" valve lift to compare different heads will be the best comparison for a street motor.
    Green is percentage of exhaust flow compared to intake flow.
    Last edited by techinspector1; 02-07-2007 at 08:44 PM.
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  8. 02-08-2007 01:07 PM #7
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    Man, the new Dart Iron Eagle platinum's have really improved over the older versions! They might actually be worth buying a set now.
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  9. 02-08-2007 03:39 PM #8
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    I'm going to get a beating now:
    Flow isn't everything.
    You have to check the chamber shape, CR, size and shape of the intake runners... I would never get a head only based on the flow-numbers, otherwise everyone would run 882's
    But the chart is very helpful, I like my 492's even better now that I KNOW they're good
    Thanks a lot Tech,
    Max
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  10. 02-08-2007 04:53 PM #9
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    True, but I don't think there's any aftermarket head with as bad of a chamber as an 882 or any other smog era head.
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  11. 02-08-2007 06:40 PM #10
    jimmyjeep
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    Whats your best guess on how much flow increase I'll see by having installed the 2.02/1.70's in my 462 heads?
    "oohh...thats gonna leave a mark!"

    1997 s-10, 357 C.I., 350 turbo, speedpro 11:1,Comp Cam custom grind mech. roller, Canfield heads, 1.6 roller rockers, edelbrock tm-1, holley 750sp, Hooker Headers, MSD, 3K B&M stall, 4:11 gears
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  12. 02-08-2007 07:23 PM #11
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    Quote Originally Posted by MadMax
    I'm going to get a beating now:
    Flow isn't everything.
    You have to check the chamber shape, CR, size and shape of the intake runners... I would never get a head only based on the flow-numbers, otherwise everyone would run 882's
    But the chart is very helpful, I like my 492's even better now that I KNOW they're good
    Thanks a lot Tech,
    Max
    You need to look at flow numbers in the middle,not at .100 or .500 but in the .200 to .400 area depending on you camshaft profile.
    Your valves spend very little time at min. lift or max. lift.
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