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AFR Heads

This is a discussion on AFR Heads within the Internal Engine forums, part of the LSx Technical Help Section category; I keep reading different things about the heads that Afr makes for ls engines. Are they gm castings? IF not ...

  1. #1
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    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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    Slow'er'Ass Mr. Luos's Avatar
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    They are not GM castings.


    They are similiar to LS1 heads, but they are cast with their own design.
    385 they should be fine.
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    Junior Member macca33's Avatar
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    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,

    Macca

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    Member silverz28camaro's Avatar
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    If you have the dough these heads are your best bet.
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    Member C&Cbird's Avatar
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    I wouldn't say best, but they are a good set of heads.

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    Senior Member rajiv1998's Avatar
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    Quote Originally Posted by C&Cbird View Post
    I wouldn't say best, but they are a good set of heads.
    They are THE BEST heads out there on the market that $ can buy.

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    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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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by C&Cbird View Post
    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.
    +1 on ETP.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by C&Cbird View Post
    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.
    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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    Member C&Cbird's Avatar
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    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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    Moderator Firebirdjones's Avatar
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    I understand,,,just seemed like a vague comparison without stating the differences.

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    how about best flowing street legal head?

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by emotionalpiracy View Post
    how about best flowing street legal head?
    Define "street legal head". What heads aren't "street legal"?

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