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AFR 205's for a 408?

This is a discussion on AFR 205's for a 408? within the Internal Engine forums, part of the LSx Technical Help Section category; Are the valves on the AFR 205's too small for a 408? Is it a weak combination?...

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    Member Bouvers's Avatar
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    AFR 205's for a 408?

    Are the valves on the AFR 205's too small for a 408?

    Is it a weak combination?

  2. #2
    TunedbyFrost.com Tuner Frost's Avatar
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    No and no, but it also depends on what you are looking to do...

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    Quote Originally Posted by Bouvers View Post
    Are the valves on the AFR 205's too small for a 408?

    Is it a weak combination?
    Not to sure if they are weak but it all depends on the parts in the motor & what you are trying to do with the car. The place I go to Virginia Speed built a 408 Stroker motor out of a 6.0L truck block going in a 02 Camaro 35th.I talked the them they used Trick Flow 235's on it. I watched it be dynoed and it made a crap ton of power.
    From what I have heard though AFR's are nice as far as casting goes but junk when it came to the internals meaning springs and such.
    Last edited by Cohi; 12-19-2008 at 12:14 PM.

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    Kenne-Bell Killer Cayenne97's Avatar
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    Quote Originally Posted by Bouvers View Post
    Are the valves on the AFR 205's too small for a 408?

    Is it a weak combination?
    I like to see 205's on smaller cubed engines. I'd suggest nothing under 225cc's.

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by Cayenne97 View Post
    I like to see 205's on smaller cubed engines. I'd suggest nothing under 225cc's.
    have made 540 on a 402 with these with monster mid range tq.

    It is a common misperception... not saying that the 225s won't work, but you can't really tell him what head to run until he gives the whole picture,

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    Member Bouvers's Avatar
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    well there is no picture I'm just curious there is a slight chance I might want to go to a Aluminum LS2 408 stroker in the future and I was wondering if along with the whole rotating assembly and a new cam I could be done and change over everything I have from my present build and still get full power out of it.

    Current

    346 stock rotating assembly
    228/230 cam
    Ported FAST92
    AFR 205's 62cc
    full valvetrain upgrades
    full bolts on with exhaust cutout

    I chose those specs primarily for a strong weekend warrior LS1 my chances of building up a 408 are ALOT better if I don't have to get different heads along with a cam when doing it...

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    TunedbyFrost.com Tuner Frost's Avatar
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    that thing would be a stump puller with those H/C!

    You could put a little coin into having them ported if you can spare it. I'd sell that cam on the forum and go with something slightly different if feasible...

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    Member Bouvers's Avatar
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    well I was definately going to get a better cam as I imagine there would be one better suited for a 408 my main concern is whether or not my heads would be miss-matched since I just dumped TONNES of coin for them... I'm thinking maybe porting them but is there just way better heads out there?

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