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Thread: AFR Heads
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04-07-2008, 01:17 PM #1
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triple black- 02 z28 m6
AFR Heads
I keep reading different things about the heads that Afr makes for ls engines. Are they gm castings? IF not are they similar to ls1 or ls6? afr suggest the 225 head will cause loss of low end torque in the 346, and that they should be used for 396 or larger. Anyone think ill lose torque on a 385?
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04-07-2008, 01:19 PM #2
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Red Tint Jewelcoat- 2008 Trailblazer SS
They are not GM castings.
They are similiar to LS1 heads, but they are cast with their own design.
385 they should be fine.2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
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04-10-2008, 09:04 PM #3
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Shanghai Mica- 2001 HSV SenatorSignature
The AFR heads are a proprietary casting, which is CNC'd and is superior in many ways to the original GM castings - Valve size, port designs, etc.... The good thing about them is that they are a straight bolt-on, matching all aspects of the OEM block/manifold/rockers, etc.
The 225s would be suited to your application.
Cheers,
MaccaOne of HSV's finest:- http://www.cardomain.com/ride/2221327/1
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04-10-2008, 09:30 PM #4
If you have the dough these heads are your best bet.
2000 auto camaro
13.54 @ 104 2.049 60' stock 2.73
12.94 @ 109 2.002 60' full exhaust, lid, tune, nitto 555r 2.73
11.899 @ 114.44 1.686 60' full exhaust, lid, tune, nitto 245/50-16 555r 3.73 moser 12-bolt 2800 fuddle, ls6 intake manifold, slp under drive pully,fiberglass hood, bmr k-member
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04-11-2008, 03:36 AM #5
I wouldn't say best, but they are a good set of heads.
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04-11-2008, 06:27 PM #6
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04-13-2008, 12:28 AM #7
No, they are not, there are better heads if your willing to pay. ET Performance has some heads that will kill the AFRs and the LS7 heads are better as well.
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04-13-2008, 11:50 AM #8
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04-13-2008, 07:14 PM #9
I believe a couple things need to be considered here before comparing.
For starters,,,the ET heads and the LS7 heads are based off of different valve angles. This changes things considerably.
You also have to consider which cc intake runner from one to the other.
The LS1 ET heads for instance range from 215 cc intake runners to 265 cc intake runners and they are all based off of 11 degree valve angles,,,,thats a huge difference from the stock 15 degree angles that AFR uses,,,which is what stock LS1 heads have in the first place.
LS7 heads are based off of 12 degree valve angles,,,,again a huge change from stock LS1 (AFR) 15 degree angles.
If head comparisons are going to be made then they should stay on the same valve angles to give people a real idea what they are buying here.
Changing the valve angles from one head to another and then trying to make comparisons is like comparing apples to oranges. Something to keep in mind when shopping around.
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04-13-2008, 10:21 PM #10
I know this, firebirdjones, I was referring to rajiv's post that says they are the best heads that money can buy, which is not correct. Not all ETP heads have different valve angles.
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04-14-2008, 03:39 AM #11
I understand,,,just seemed like a vague comparison without stating the differences.
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04-15-2008, 07:44 AM #12
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triple black- 02 z28 m6
how about best flowing street legal head?
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04-15-2008, 08:31 AM #13
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