dont get it.. afr205's vs. tsp st2.5-5.3's
03-19-2008, 03:07 PM
#22
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03-19-2008, 04:50 PM
#23
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Thick deck is not the only difference
>Dual quench pads (very good for high compression) and fuel burn eficiency,
>Much more PTVC allowing bigger cams to be run without flycutting.
>205cc runner (equal more trq),
>higher velocity (better feeding of chamber)
>Better swirl
So yes, you are not just paying for the name. AFR is still the best 15* aftermarket head.
Show me the last 475rwhp combo out of a stock casting and a 224/228 cam under .590 lifts. AFR delivers consistantly within the range of cams it was designed for
>Dual quench pads (very good for high compression) and fuel burn eficiency,
>Much more PTVC allowing bigger cams to be run without flycutting.
>205cc runner (equal more trq),
>higher velocity (better feeding of chamber)
>Better swirl
So yes, you are not just paying for the name. AFR is still the best 15* aftermarket head.
Show me the last 475rwhp combo out of a stock casting and a 224/228 cam under .590 lifts. AFR delivers consistantly within the range of cams it was designed for
Last edited by PREDATOR-Z; 03-20-2008 at 06:52 AM. Reason: Sorry I was just working on SBC stuff
03-20-2008, 06:30 AM
#24
Thick deck is not the only difference
>Dual quench pads (very good for high compression) and fuel burn eficiency,
>Much more PTVC allowing bigger cams to be run without flycutting.
>205cc runner (equal more trq),
>higher velocity (better feeding of chamber)
>Better swirl
So yes, you are not just paying for the name. AFR is still the best 23* aftermarket head.
Show me the last 475rwhp combo out of a stock casting and a 224/228 cam under .590 lifts. AFR delivers consistantly within the range of cams it was designed for
>Dual quench pads (very good for high compression) and fuel burn eficiency,
>Much more PTVC allowing bigger cams to be run without flycutting.
>205cc runner (equal more trq),
>higher velocity (better feeding of chamber)
>Better swirl
So yes, you are not just paying for the name. AFR is still the best 23* aftermarket head.
Show me the last 475rwhp combo out of a stock casting and a 224/228 cam under .590 lifts. AFR delivers consistantly within the range of cams it was designed for
It's a 15 * head.
Sorry, I was just working on some SBC stuff, late nite typing, thanks for the heads up 
03-23-2008, 12:51 AM
#27
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I dont get all this fuzz about AFR heads.. when you compare the advertised flow numbers for a set op TSP/PRC stage 2.5 5.3 heads
.300 208
.400 257
.500 290
.600 312
and a set of AFR 205.s
.200 140
.300 200
.400 261
.500 281
.550 292
.600 298
I just dont see the big difference.. are the AFR,s worth the extra 80% (plus springs) over the TSP/PRC heads?? i mean for that extra cash you could buy a fast 92/92 combo...
having Patrick G spec me a cam that propably ends up in the "torque cam" teritory... and the gar will see hard street and autocross time.. no drag strip..
.300 208
.400 257
.500 290
.600 312
and a set of AFR 205.s
.200 140
.300 200
.400 261
.500 281
.550 292
.600 298
I just dont see the big difference.. are the AFR,s worth the extra 80% (plus springs) over the TSP/PRC heads?? i mean for that extra cash you could buy a fast 92/92 combo...
having Patrick G spec me a cam that propably ends up in the "torque cam" teritory... and the gar will see hard street and autocross time.. no drag strip..
03-23-2008, 12:53 AM
#28
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I think AFR is great quality but i would never spend that much money on them. I'm a more bang for your buck guy.
If i hadn't gone with LS2's i would have spent the money on some nice 5.3L PRC's
If i hadn't gone with LS2's i would have spent the money on some nice 5.3L PRC's
03-23-2008, 10:25 AM
#30
I know the AFRs are a great quality and I also really like the TFS heads. however my car is a street car and not full track so I am choosing the PRC 5.3s and maybe adding a FAST later. I know the AFRs will get me more power but I dont need to pay $1000 for a couple tenths when my car will be plenty fast with the 5.3s and will save me money for the tune and 9" that I will need.
I will say this...later on when money allows I would like to build a track car and for that I will be looking to TFS or maybe AFR with the new 245cc(or 235cc I cant remember) that Tony Mamo is working on.
I will say this...later on when money allows I would like to build a track car and for that I will be looking to TFS or maybe AFR with the new 245cc(or 235cc I cant remember) that Tony Mamo is working on.
03-23-2008, 10:45 AM
#31
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I know the AFRs are a great quality and I also really like the TFS heads. however my car is a street car and not full track so I am choosing the PRC 5.3s and maybe adding a FAST later. I know the AFRs will get me more power but I dont need to pay $1000 for a couple tenths when my car will be plenty fast with the 5.3s and will save me money for the tune and 9" that I will need.
I will say this...later on when money allows I would like to build a track car and for that I will be looking to TFS or maybe AFR with the new 245cc(or 235cc I cant remember) that Tony Mamo is working on.
I will say this...later on when money allows I would like to build a track car and for that I will be looking to TFS or maybe AFR with the new 245cc(or 235cc I cant remember) that Tony Mamo is working on.
03-25-2008, 07:07 AM
#32
Aren't the cooling passages of the OEM head larger than the thicker deck AFR head...hence better cooling of OEM head. Whenever a head is beefed up or made thicker aren't the cooling passages made smaller. Lower volume water flow equals more heat, more heat equals detonation.
03-25-2008, 07:17 AM
#33
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Thick deck is not the only difference
>Dual quench pads (very good for high compression) and fuel burn eficiency,
>Much more PTVC allowing bigger cams to be run without flycutting.
>205cc runner (equal more trq),
>higher velocity (better feeding of chamber)
>Better swirl
>Dual quench pads (very good for high compression) and fuel burn eficiency,
>Much more PTVC allowing bigger cams to be run without flycutting.
>205cc runner (equal more trq),
>higher velocity (better feeding of chamber)
>Better swirl
On the internet it is easy to bench race flow numbers alone and most people think that flow numbers alone makes the head but there is much more to it. Flow is good and everything but the real meat and potatos in the design of a head is in the combustion chamber design/valve placement. The chamber will have a huge affect on your burn as well as your piston to valve clearances. Any company can hog out a head to get big flow numbers to impress people on the internet.
03-25-2008, 09:10 AM
#34
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just buy what you can afford... or save up and get what you want...
has for me, cash is KING. I'm going with stock castings. I know i'll get the numbers i want and save cash.
has for me, cash is KING. I'm going with stock castings. I know i'll get the numbers i want and save cash.
03-25-2008, 09:13 AM
#35
Brad, with all your "knowledge" and as a moderator we'd all expect a bit more research into your posts before making them. We have THE smallest volume runner of any CNC'd 5.3L casting available today.
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03-25-2008, 09:18 AM
#36
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Sorry if I wasnt clear about that. I wasnt playing bias or trying to dog out any head porter.
04-05-2008, 03:57 PM
#38
2 words:
Port
Velocity
Imagine you open a window. The wind is blowing air in at 10mph. How much air is flowing through that window into your room in 3 seconds? Now close the window a little bit (say 10%), and now the wind is blowing at 15mph. Will more air flow through your window into your room now in 3 seconds?
Port
Velocity
Imagine you open a window. The wind is blowing air in at 10mph. How much air is flowing through that window into your room in 3 seconds? Now close the window a little bit (say 10%), and now the wind is blowing at 15mph. Will more air flow through your window into your room now in 3 seconds?
04-05-2008, 04:36 PM
#39
2 words:
Port
Velocity
Imagine you open a window. The wind is blowing air in at 10mph. How much air is flowing through that window into your room in 3 seconds? Now close the window a little bit (say 10%), and now the wind is blowing at 15mph. Will more air flow through your window into your room now in 3 seconds?
Port
Velocity
Imagine you open a window. The wind is blowing air in at 10mph. How much air is flowing through that window into your room in 3 seconds? Now close the window a little bit (say 10%), and now the wind is blowing at 15mph. Will more air flow through your window into your room now in 3 seconds?
AFRs= max port velocity
04-05-2008, 04:45 PM
#40
On the internet it is easy to bench race flow numbers alone and most people think that flow numbers alone makes the head but there is much more to it. Flow is good and everything but the real meat and potatos in the design of a head is in the combustion chamber design/valve placement. The chamber will have a huge affect on your burn as well as your piston to valve clearances. Any company can hog out a head to get big flow numbers to impress people on the internet.