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anyone built there engine like this???

Discussion in 'The Garage' started by Tshane, Jul 31, 2003.

  1. Tshane

    Tshane 1/2 ton status

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    I'm building my 383 i was wondering if anyone use close or the same parts if so what kind of power they are getting.

    carb - 600cfm
    intake - edlebrock RPM airgap
    pistons - flat tops (compression somewhere around 11:1)
    heads - double hump 64cc
    cam - intake - .480 exhaust - .498
    duration 270 278
    its the comp cam 4x4 xtreme

    wonder if anyone had a clue what kind of hp and torque
    /forums/images/graemlins/truck.gif
     
  2. slimlynn1

    slimlynn1 1/2 ton status

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    Are you going to run race gas.
     
  3. florida4x4

    florida4x4 1/2 ton status

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    yeah if your going to run 11:1 then you might as well make it 13:1 cause you're gonna have to run cam2. Try and shoot for 9:1 or 9.5:1.
     
  4. Thumper

    Thumper 1/2 ton status

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    Based on the advice I got when I built mine, you need to decide whether you are building a 4x4 motor or a race motor. It seems like the things you listed will work against each other. Those heads are prolly large valves which are good for high revs, but will actually bite you when you try to get low end torque. The high compression will bite you too. I am no expert, but thats what I have been hearing from people I asked. You have to build a motor with all parts geared towards a common goal. Id do a little research before I start spending.
    IMO
    Good Luck
    Mike
     
  5. Beast388

    Beast388 1/2 ton status

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    [ QUOTE ]
    I'm building my 383 i was wondering if anyone use close or the same parts if so what kind of power they are getting.

    carb - 600cfm - Too small IMO
    intake - edlebrock RPM airgap - good intake but doesn't work the best in winter, cools too well
    pistons - flat tops (compression somewhere around 11:1)- too much compression for a street/non-race motor. Try to get around 9-9.5:1
    heads - double hump 64cc - Do you already own these? There are better heads out there
    cam - intake - .480 exhaust - .498- Call Comp Cams and let them recommend a cam for you
    duration 270 278
    its the comp cam 4x4 xtreme- I am using the 254 Xtreme

    wonder if anyone had a clue what kind of hp and torque
    /forums/images/graemlins/truck.gif

    [/ QUOTE ]

    Hey.....a local guy...cool!

    Those parts you listed are a mixture that won't work the best together. Here is what I have in my 388.

    Carb: 750cfm
    Intake: Perf RPM
    Pistons: KB 12cc dish 72cc chambers = 9.46:1
    Heads: S/R Torquers 67cc (72cc measured) 2.02/1.60 valves
    Cam: Comp 4X4 Xtreme 210/218 duration @0.50 .447/.462 lift

    I make around 350hp and 420ft/Lbs of torque.

    If you have 383 building questions, ask away or PM me....be glad to help. /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  6. Tshane

    Tshane 1/2 ton status

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    The valves are not that big i compaired them with other heads and the deal i got on them i can not pass them up. If i dont like them i'll throw them on my chevelle and go to the junk yard and get a set of 72 cc heads. Guy that building it for me is running same compression and can run 93 without it pinging.
     
  7. sled_dog

    sled_dog 1 ton status

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    yeah but is he running aluminum heads? 11:1 with aluminums would be understandable. My friend claims his Nova runs 12:1 compression on 93 but when he added like half a tank of 108 it ran WAY better.
     
  8. Tshane

    Tshane 1/2 ton status

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    dang.........now u guys got me thinkin i should just go with 72cc heads.........would be cheaper on gas to....what kind of compression would i have with flat tops and 72cc heads
     
  9. sled_dog

    sled_dog 1 ton status

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    just a guess, not taking all your components or head gasket stuff, but upper 9s I think. Much more reasonable for pump 93 or 94.
     
  10. Beast388

    Beast388 1/2 ton status

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    With a 72cc head, 12cc dished piston, 4.06" bore, 3.75" stroke, etc etc....I'm at 9.46:1

    I punched the specs that you described above into my spreadsheet and this is what I came up with. Flat top 4 valve-relief pistons have about -7cc volume.

    CID 382.6680858
    Comp. Ratio 10.681:1
    Liters 6.27
    Bore 4.030
    Stroke 3.750
    Piston CC 7.000
    Head CC 64.000
    Gasket Thickness 0.041
    Gasket Bore 4.166
    Deck Height 0.004

    Swept Volume 47.8335
    TDC Volume 4.9409
    Gasket Volume 0.5589
    Deck Volume 0.0510
    Head Volume 3.9040
    Piston Volume 0.4270

    Again....I changed the head CC's to 72....

    CID 382.6680858
    Comp. Ratio 9.811:1
    Liters 6.27
    Bore 4.030
    Stroke 3.750
    Piston CC 7.000
    Head CC 72.000
    Gasket Thickness 0.041
    Gasket Bore 4.166
    Deck Height 0.004

    Swept Volume 47.8335
    TDC Volume 5.4289
    Gasket Volume 0.5589
    Deck Volume 0.0510
    Head Volume 4.3920
    Piston Volume 0.4270

    9.8:1 is way more manageable, although still a bit high for street/heavy load ie. a K5 use.

    Just for reference, here are my specs. I am not saying this is the only way to build a Stroker, but it works for me. /forums/images/graemlins/thumb.gif

    CID 388.3865832
    Comp. Ratio 9.466:1
    Liters 6.36
    Bore 4.060
    Stroke 3.750
    Piston CC 12.000
    Head CC 72.000
    Gasket Thickness 0.041
    Gasket Bore 4.166
    Deck Height 0.004

    Swept Volume 48.5483
    TDC Volume 5.7347
    Gasket Volume 0.5589
    Deck Volume 0.0518
    Head Volume 4.3920
    Piston Volume 0.7320

    /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    Like others have mentioned, what is the truck going to be used for? Rock climbing or mud? There have been pretty recent tests showing that 1000CFM carbs on fairly mild 350's or 383's are actually better than smaller ones. Of course, if you don't intend to spin the motor that high, it's pretty pointless.

    And also as was mentioned, (and you admitted that you might go with 72CC heads) there are better heads out there if you are going to buy some. Stock older heads just aren't that good, again very dependent on how the engine will be used.
     

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