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my 408 build up

This is a discussion on my 408 build up within the Internal Engine forums, part of the LSx Technical Help Section category; ohh... and u dont have any soundclips from ur car?...

  1. #21
    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    ohh... and u dont have any soundclips from ur car?

  2. #22
    Senior Member mrr23's Avatar
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    um no. i'm still building my motor. hence the title.

  3. #23
    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    shit. me <---

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    Senior Member mrr23's Avatar
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    bottom of page shows where i had to drill the block for the alternator bracket today.

  5. #25
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    Quote Originally Posted by mrr23 View Post
    bottom of page shows where i had to drill the block for the alternator bracket today.
    Nice! I got a 408 build up in the process also. Mines gonna be on boost. It's a solid roller motor wit 9:1 compression pistons, with etp gIII26540 cylinder heads wich makes it 8.5:1. I'm still deciding which blower im goin with. Its either the procharger f1r or f2m. We're lookin to get anywhere from 25-30 psi out of it.
    There's alot more thats goin on with it, its to much to list.

  6. #26
    Senior Member mrr23's Avatar
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    good deal

  7. #27
    Senior Member mrr23's Avatar
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    today's episode is more external. got the NX intake, XL direct port system and 85MM TB today. pics are up of them.

  8. #28
    67 Tempest, click the pic mullenh's Avatar
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    Quote Originally Posted by ATCharming View Post
    ohh... and u dont have any soundclips from ur car?
    if you want to hear sound clip go to VHP web site

  9. #29
    Senior Member Street Lethal's Avatar
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    Quote Originally Posted by boostedSS
    ...got a 408 build up in the process also. It's a solid roller motor wit 9:1 compression pistons, with etp gIII26540 cylinder heads wich makes it 8.5:1. I'm still deciding which blower im goin with. Its either the procharger f1r or f2m.

    We're lookin to get anywhere from 25-30 psi out of it....
    That's going to be sweet, what will the cam specs be...?

  10. #30
    Senior Member mrr23's Avatar
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    pics of the heads and shaft rockers are up now.

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    Veteran Hi-Po's Avatar
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    oh damn, that port job looks great. The tear drop on that thing is incredible!! Some nice heads. Those rockers are so damn close!! This set up looks great. The NX intake looks sick. Cant wait for some track times.

  12. #32
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    Quote Originally Posted by mrr23 View Post
    http://www.stealthram.com/408.htm
    this is for the black car
    KILLER.
    99 WS6 M6 NBM !Cags,!Cats,Vinci/Crane,Hurst,Detroit TruTrac,3:73,31 Splne,Edel.Race LT's,ORY,QTEC,Flow,ARP,Percy,MSD,SLP,AC/DELCO,Bosch,GMPP,Cntrfrce DF,Htchkiss,Susp.Tech,Lakewood,285's,Bilstein,Pro-kit,SLP,RK Sprt,A/Meter,Red Optima,Magnaflow S/S Tips,Hd Pins,Tint,Fire.Ex,[*4 Hot Rod Power Tours*]

  13. #33
    Pathelogical Liar BlackLT1Z28's Avatar
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    May I ask why the 117 LSA on your cam? I thought with spray, you wanted something lower. Teach me...

  14. #34
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    117* sounds like its gonna be a great nitrous cam. You want a wider lsa to prevent the nitrous charged intake from being purged out the exhaust valve. Really, the intake valve seat timing doesnt require much re-vised thought when adding nitrous. The exhaust is a must. Using a dual pattern cam is a must. Opening the valve earlier will help with bleeding off some pressure before the piston starts moving up. This cuts into the power stroke alittle yes, but in nitrous applications it makes more power than holding it shut longer. Also, a high lift cam is not needed in a nitrous app. as you can see in Mrr23 .551" lift.

    Thats all i got. Maybe someone can correct some of my babble.
    Last edited by Hi-Po; 03-06-2007 at 07:26 PM.

  15. #35
    Pathelogical Liar BlackLT1Z28's Avatar
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    I thought you wanted an LSA around 110 or so to knock down cylinder pressures some with FI. At least, that's what I read in an article from GMHTP.

  16. #36
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    Quote Originally Posted by BlackLT1Z28 View Post
    I thought you wanted an LSA around 110 or so to knock down cylinder pressures some with FI. At least, that's what I read in an article from GMHTP.
    nah, 112* to 116* are common in nitrous app.

  17. #37
    Senior Member mrr23's Avatar
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    Quote Originally Posted by BlackLT1Z28 View Post
    May I ask why the 117 LSA on your cam? I thought with spray, you wanted something lower. Teach me...

    what hi-po said is true. it has to do with overlap.

    DUR @ .004" 294* / 302*
    DUR @ .050" 232*/ 240*
    LIFT .551/.551
    OVERLAP 64*
    LSA 117*

    DUR @ .004" 294*/ 302*
    DUR @ .050" 232*/ 240*
    LIFT .600/.600
    OVERLAP 76*
    LSA 110*

    you'll notice the overlap. the closer the LSA, given all the other numbers are the same, the intake and exhaust valves are open together for a longer period of time. this results in some of the incoming charge escaping out the exhaust.

    now, the downside, if you call it that, is a longer powerband with lower power. meaning, the tighter the LSA, the more midrange power you make, at the expense of how long you make that power.

    so

    wide LSA, less overlap = longer powerband, less midrange
    tight LSA, more overlap = shorter powerband, more midrange

  18. #38
    Senior Member mrr23's Avatar
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    Quote Originally Posted by BlackLT1Z28 View Post
    I thought you wanted an LSA around 110 or so to knock down cylinder pressures some with FI. At least, that's what I read in an article from GMHTP.
    never. you want to trap the charge to build cylinder pressure. but, you've got to figure out just how much cylinder pressure your motor can handle. the more pressure, the more power made.

  19. #39
    Senior Member mrr23's Avatar
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    Quote Originally Posted by Hi-Po View Post
    Also, a high lift cam is not needed in a nitrous app. as you can see in Mrr23 .551" lift.
    one thing you didn't notice. i'll be using 1.8 rockers. i'll have a total lift of .589. duration has more to do with cylinder filling vs lift. lift is secondary. it's all a balance.

  20. #40
    Senior Member mrr23's Avatar
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    heads and rockers are on

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