AFR LS1 205cc
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From: oxford, Michigan
AFR LS1 205cc Just saw this in Feb Hot Rod mag.
Flow numbers for the AFR 205-not sure if they are as cast or cnc ported
AFR ---------------- LS1---------------Ls6 -----------GMPP LS6
.200---144/116-------136/108 -----------137/116-----------142/113
.300---208/170-------196/145------------188/153-----------209/156
.400---255/206-------217/170------------233/175-----------257/189
.500---287/221-------224/186------------260/193-----------283/220
.550---296/227-------227/192------------245/227-----------286/199
.600---302/232-------230/198------------245/200---------- 287/231
.650---304/236-------233/200------------245/202-----------289/233
4.125 bore fixture and 1.875 flow tube
Flow numbers for the AFR 205-not sure if they are as cast or cnc ported
AFR ---------------- LS1---------------Ls6 -----------GMPP LS6
.200---144/116-------136/108 -----------137/116-----------142/113
.300---208/170-------196/145------------188/153-----------209/156
.400---255/206-------217/170------------233/175-----------257/189
.500---287/221-------224/186------------260/193-----------283/220
.550---296/227-------227/192------------245/227-----------286/199
.600---302/232-------230/198------------245/200---------- 287/231
.650---304/236-------233/200------------245/202-----------289/233
4.125 bore fixture and 1.875 flow tube
Last edited by Y2KAIR; Dec 30, 2003 at 07:07 PM. Reason: typo
Does anyone know the flow numbers on a standard LS1 bore size? Why the heck did they flow them on a 4.125 bore? That's not a good standard for comparison at all.
Last edited by gomer; Dec 30, 2003 at 04:18 PM.
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From: Raleigh, NC
Originally Posted by Linear Velocity
Hmm, how much more can they get out of those? My 5.7 LS1 heads flowed 337 cfm @ .600" on the intake, doesn't look like the AFR's will be worth the money 
That is what I was thinking. Intake numbers look OK, mid lift numbers look good, but exhaust numbers leave some to be desired.
Originally Posted by Linear Velocity
Hmm, how much more can they get out of those? My 5.7 LS1 heads flowed 337 cfm @ .600" on the intake, doesn't look like the AFR's will be worth the money
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Gomer I totally agree. Flowing on a 4.125 bore with the 205 heads is very deceiving because those 205 heads are suppose to be for stock cubed motors up to around 400CI motors. They should have flowed them on a 3.905 bore.
Linear whose heads are those that flowed 337??? I have NEVER seen a set flow that much on a 3.905 or 4.00 bore. Never mind!!! I see you have a big bore motor!!!!!
Linear whose heads are those that flowed 337??? I have NEVER seen a set flow that much on a 3.905 or 4.00 bore. Never mind!!! I see you have a big bore motor!!!!!
Last edited by sr71bb; Dec 30, 2003 at 05:18 PM.
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Originally Posted by sr71bb
Gomer I totally agree. Flowing on a 4.125 bore with the 205 heads is very deceiving because those 205 heads are suppose to be for stock cubed motors up to around 400CI motors. They should have flowed them on a 3.905 bore.
Linear whose heads are those that flowed 337??? I have NEVER seen a set flow that much on a 3.905 or 4.00 bore. Never mind!!! I see you have a big bore motor!!!!!
Linear whose heads are those that flowed 337??? I have NEVER seen a set flow that much on a 3.905 or 4.00 bore. Never mind!!! I see you have a big bore motor!!!!!
Staging Lane
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I'm curious to see the stock LS1 and LS6 numbers, for comparison to the AFR's, and also if those were as-cast or CNC'd numbers.
I have to admit, I'm a bit nonplussed by those numbers as well. Might feel OK about not spending a million bucks on heads after all...
-Jake
I have to admit, I'm a bit nonplussed by those numbers as well. Might feel OK about not spending a million bucks on heads after all...
-Jake
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From: Los Angeles
Definitly need to compare against numbers on the same bench to figure out if they are impressive or not. The stock head numbers would maybe help give us a baseline as to how that flowbench/testing conditions compare.
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From: oxford, Michigan
i added the stock LS1 and Ls6 to the original post. The add also mentions that the AFR's cross section in the intake port is 30% smaller than the ported GMPP.(more velocity) And that the AFR's have a raised short turn radius for better flow to the back of the valve
Originally Posted by MONGOOSEWS7
AFR also makes a 220cc head. so if the 205 head flows 302/232 at .600 lft imagine what the 220 would flow!
BUT that 302/232 is on a 4.125 bore. That totally skews the numbers. The difference in flow between a 3.905 and 4.125 bore is substantial. Published numbers like that are good for one thing.. selling heads to people that don't know any better. Is there ANY numbers out on these heads being flowed on a 3.905 bore?
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From: Forced Induction Heaven
AFR has been great in the industry. My flow numbers off of my Stage II LS6 heads (2.02/1.57 valves) flow better than those 4.125" bore heads..if they have the big valves the intake should be more like 360 @ 600. Howerver AFR knows a lot more about heads than I do. I trust thier product..it will be nice to see what kind of dyno numbers they get out of those heads....remember our intakes only flow so much..so whats the use until we free up that restriction.
Yeah, need to get a sponsor or something to set up a flowbench, with a set of each heads, same bench, bore, pipe etc.....and then see numbers. But right on about smaller port, and velocity.
I think you guy's might be jumping on the wrong part here..Those AFR flow #'s with only 205cc ports is awesome,if true..My Ported LS6's flow alittle more but the port is 221cc.(stock is 215cc)..By the way it looks,346's with these heads will kick *** across the rev range over stage 2 ported heads due to the velocity....
I wish they will hurry up and release them so we can stop debating and find the facts!!!!!
I wish they will hurry up and release them so we can stop debating and find the facts!!!!!