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What Heads for my 408?

This is a discussion on What Heads for my 408? within the Internal Engine forums, part of the LSx Technical Help Section category; Been slowing putting together a 408 build. Getting the stock 6.0L Iron block bored to 4.030 this week and then ...

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    Member SteelmanLS1's Avatar
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    What Heads for my 408?

    Been slowing putting together a 408 build. Getting the stock 6.0L Iron block bored to 4.030 this week and then I am going to start on parts..

    I live in OK and even though this isn't my DD, I do drive it daily since it gets better MPG's than my pickup. I am putting a 408 together to swap in it and want it streetable, like Mr. Luos's T/A . I want it streetable even if I don't drive it everyday.

    My problem is, WHAT HEADS?? I am pretty sure on the TSP Giant cam though. And I want around 11:1 compression.

    I want around 530-540RWHP and right around 500RWTQ.

    My advantage is my Uncle and Grandpa run a Custom Engine shop here and they can get parts 25%-30% cheaper than I can off TSP or anything like that with all the Porting and Polishing capability with their shop's machines. Also I will get free labor on putting it all together the professional way. They do high-end build for old and new muscle cars and a BUNCH of the sprint car motors here that put out 500-600HP out of a SBC motor with 5.88 gears around a dirt track

    So what heads? Here are some I have been looking at.. Remember I am wanting Around 11:1 compression, maybe more if I can get away with it??

    Motor specs.

    Bore: 4.030
    Stroke: 4.000
    Deck Height: ? Stock 02 2500HD 6.0L block
    Head Gasket: Up in the air right now, .045 or .055 depending on CR
    Pistons: Depends on heads/and CR
    http://www.c5frc.com/calculators/Com...Calculator.htm

    Here are the heads. Anything else is possible.. Just want around that CR..

    http://www.texas-speed.com/shop/item...d=135&catid=40
    http://www.worldcastings.com/prods_p...arhawkls1x.htm


    This is the last motor they did for my last DD, 98 Grand Prix GTP motor (bought it with a spun bearing)

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    Member knappbunch's Avatar
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    I put tfs 235 cnc's on my 402 hoping to get it on the dyno tonight or tomorrow.

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    Member SteelmanLS1's Avatar
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    Quote Originally Posted by knappbunch View Post
    I put tfs 235 cnc's on my 402 hoping to get it on the dyno tonight or tomorrow.
    What cam, and what CR? Please tell me more and keep me updated!!

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    Member SteelmanLS1's Avatar
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    Quote Originally Posted by knappbunch View Post
    I put tfs 235 cnc's on my 402 hoping to get it on the dyno tonight or tomorrow.
    Those heads you got might be perfect for me...

    http://www.trickflow.com/egnsearch.a...0&autoview=sku

    With a .045 gasket, and the stock CC chambers these come with I got 11:1 CR

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    Quote Originally Posted by knappbunch View Post
    I put tfs 235 cnc's on my 402 hoping to get it on the dyno tonight or tomorrow.
    The trickflows are definatly nice I saw this motor being dynoed and it is nasty

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