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383 and cams

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Nov 1, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    Ok, I got lots of good info from the 383 heads post.
    Now I need some info on a good cam for a 383 with vortec heads and a TBI.
    I'd like to stay mild so I dont have to modify the vortec heads.

    But I dont know how a cam will react with the stroke of the 383. So any info you all can give would be nice.

    Surgeon General's Warning:
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  2. I would go with a comp cam grind # XE256H-12.The main thing is to keep a lobe seperaton of at least 112 for the computer to work correctly.This is good grind for a mild fuel injected motor.

    Here's the specs.
    duration 256in/268ex...........lift .449in/.456ex....lobe sep is 112

    You want to stay with a fatter ex side to take full advantage of the vortec heads.Just my $.02
     
  3. Andreas

    Andreas 1/2 ton status

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    Maybe the Edelbrock Performer Plus could be something for you? The grind is intended for csb 400´s according to Edelbrock, but I suspect a 383 will do[​IMG][​IMG]

    Specs are 214/214 @.050" Lift.479"/.488" Stock Vortec valvesprings wont handle that lift. You will need some work done to your TBi too (computerstuff).

    Oh, just re-read your post and you don´t wanna modify the heads..... Hmmmm (thinking hard now). Well, keep the duration @.050 around 210-220 (advertised duration around 260) and you´ll have a torque engine. Personally I´d get some valvesprings and run a Xtreme Energy 4x4 270[​IMG]

    Andreas

    406cui of pure sh*t[​IMG]
     
  4. ftn96

    ftn96 1/2 ton status

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    ALrighty then. Sounds good. That falls with in the spec of the vortec heads so I dont have to do no mods to them. You gonna bring it down with you this weekend? [​IMG]

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  5. Bring what? Got everything loaded up last nite. I should be in Nashvile around 8 p.m.
     
  6. ftn96

    ftn96 1/2 ton status

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    The cam your recommending. I figured you had one in your back pocket and was gonna help ya little buddy out! [​IMG]
    You coming by tonight or Saturday?
    I got heat in the garage now!!! Still no trash can though!!![​IMG]

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  7. No trash can YET!! Damn !!!LOL No cam,sorry.Its a good cam though.A friend is running it in his 90 chevy sb,He's got a 78 400 with vortec heads on it with this cam.His truck runs 9.10's at Union Hill in the 1/8.Which isn't bad for 4x4 truck.

    I'll prob come tonite,I'm going to leave sat nite so I can work on the Jimmy sun.Karens going to stay at her mothers all week and they're bringing her home next week end.
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

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    An Xtreme 4x4 cam is ground on a 111* lobe seperation angle. No good at all for fuel injection. I would be very careful with cam selection if I were you, intake reversion will make that MAP sensor go nuts.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  9. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well I stated this in a PM to ya, but gonna post it. Last time I called up Comp Cams the only setup they had for rockers was a roller rocker. Thus keep that in mind... numerous other manufacturers make a hyd setup w/ a self aligning rocker.

    In this day in age, it is a bit, ehh shall I say silly for lack of a better word, to try and pick your own cam, especially for a FI setup unless you REALLY know cams well. The tech lines now that each manufacturer has setup, to try and make sure each customer gets the precisily best grind, are pretty top notch. Comp Cams and Crower are both excellent if you know all the specs on your motor.

    The TBI systems aren't really known for accepting much cam. You can also talk to Turbo city that has some modified MAP's and such to allow the use of a larger cam.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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