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241 heads for power

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Old 09-17-2008, 03:29 PM
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Here's a flowchart of ported AFR heads, ported by Tony, used in a 500+ rwhp 346:

AFR 205s with 57cc chamber:
Lift.........200", .300", .400", .500", .550", .600"
Intake.....158,.. 220,.. 264,.. 285,.. 296,.. 300
Exhaust.. 122,.. 178,.. 217,.. 232,.. N/A,.. 241

Just throwing that out there.
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Old 09-17-2008, 05:19 PM
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They were hand ported by him. Those were not the normal "production CNC" 205's if i recall correctly.
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Old 09-17-2008, 05:54 PM
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Originally Posted by djsanchez2
They were hand ported by him. Those were not the normal "production CNC" 205's if i recall correctly.
Correct, It illustrates what someone mentioned earlier that its not all about peak flow #'s.
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Old 09-17-2008, 06:13 PM
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Uhhh that was actually me
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Old 09-17-2008, 08:02 PM
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so i should probably just get some 243 heads huh? that seems to be the general concensus. i was just curious what a port job, a valve job and maybe a milling or different head gasket would do for me. guess it isnt worth the money
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Old 09-17-2008, 10:50 PM
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In all honesty i would say it all depends on what you want out of the car and what other supporting mods will be used.
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Old 09-18-2008, 11:03 AM
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How Much Cfm Could Fully Ported Ls6 Heads Flow
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Old 09-18-2008, 12:05 PM
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The most extreme stock casting LS6 heads I have seen are 320cfm.
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Old 09-18-2008, 12:45 PM
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Originally Posted by djsanchez2
The most extreme stock casting LS6 heads I have seen are 320cfm.
what size valves and what bore size were the heads flowed on?
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Old 09-18-2008, 01:54 PM
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And Who Did The Work
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Old 09-18-2008, 11:29 PM
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ttttttttt
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Old 09-19-2008, 12:25 PM
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What are the flow numbers on all the different above mentioned STOCK heads?
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Old 09-19-2008, 12:43 PM
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stock unported?
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Old 09-19-2008, 12:48 PM
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Originally Posted by SUCK MY SS
stock unported?
Yeah. Like if you were to take the heads straight off a car. I just want to see what base numbers look like on different heads before a +/- 300cfm port job.

...I'm just curious.
Last edited by Sommer86; 09-19-2008 at 12:50 PM. Reason: edit text and typos
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Old 09-19-2008, 12:54 PM
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Originally Posted by Sommer86
Yeah. Like if you were to take the heads straight off a car. I just want to see what base numbers look like on different heads before a +/- 300cfm port job.

...I'm just curious.
853<241<243
Don't know the numbers, but I'd like to learn them.
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Old 09-19-2008, 01:14 PM
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IIRC its something like 225/175 @ .600 on a stock ls1 head
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Old 09-19-2008, 01:26 PM
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Originally Posted by SUCK MY SS
IIRC its something like 225/175 @ .600 on a stock ls1 head
Which one? 853? 241?
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Old 09-19-2008, 02:05 PM
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Originally Posted by ss.slp.ls1
Which one? 853? 241?
same ****
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Old 09-19-2008, 02:19 PM
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Originally Posted by SUCK MY SS
same ****
I read that due to the differences in casting processes that the 241's are superior to 853's (slightly), but once ported any differences are moot.
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Old 09-19-2008, 02:38 PM
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i've heard the same...
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