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383 questions

Discussion in 'The Garage' started by FMJ, May 2, 2005.

  1. FMJ

    FMJ Registered Member

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    I'm building a 383 for a friend of mine, but i ened some opinions on cam and rockers. This is the cam that i'm looking at:Xtreme Energy XE256H Hydraulic Flat Tappet Camshaft & Lifter Kit
    Lift: .447''/.454''
    Duration: 256°/268°
    RPM Range: 1000-5200

    The engine is for a camaro, so i figured that cam would be the best. I don't really know what to get for rockers though, should we just use the stock ones? Money isn't really an issue if somthing will give more power we will get it.
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Need to know a few more things about the Camaro firts , like gearing etc to guess at a better cam .

    generally dual pattern cams work great in smog years .

    Roller rockers good to reduce friction , make more horsepower .

    Aftermarket rockers period are better as they are always closer to their stated ratio than stock stamped steel one .
     
  3. FMJ

    FMJ Registered Member

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    well, this is minnesota so no smog ( it used to have it) and the camaro has 3.73 gears and a th 350 with a shift kit. Any recomendations for roller rockers?
     
  4. dirtwarrior17

    dirtwarrior17 Banned

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    Yep, roller rockers are a good choice but the power gains are strictly higher rpms.

    still i would say rolller rockers.

    comp cams pro magnum rocker arms are a good choice...

    5% less weight at the valve than aluminum rockers= better response and more power.

    might want to pick up a jegs catalog.
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    So its probably a carbed engine , older Camaro ? I ran a Comp Cams 268 in my Chevelle years ago .

    I would probably convert to roller lifters now , and since you say money is no problem , add converter , intake , exhaust etc .

    I like this
    [font=Arial,Helvetica]Chevy 262-400 Xtreme Energy Retro-Fit XR294HR Cam & Lifters [/font][font=Arial,Helvetica][size=-1]HYDRAULIC ROLLER-Street /strip applications, 9.5:1 CR, intake headers, 3000+ stall, gears.[/size][/font]



    Go here http://www.compcams.com/
     
  6. FMJ

    FMJ Registered Member

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    Well this is a complete build up, 383 kit, tbi heads, performer intake, and now i guess we will go all roller. I forgot to include it's a 74' camro, sorry.
     
  7. dirtwarrior17

    dirtwarrior17 Banned

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    any camaro with a 383 is badass IMO... unless its an 80's.
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Good year of Camaro , no cats , sounds like a good project .

    I would get the heads done , or get aftermarket heads if ya can afford them .
     
  9. sled_dog

    sled_dog 1 ton status

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    TBI heads are a pretty bad choice. They really don't flow well even compared to other 1.94 valve heads.
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    What year is the engine block itself?

    Aftermarket roller cams and lifters are EXPENSIVE.

    If I were to do it over again, a one piece rear main/roller block would be my base.
     
  11. FMJ

    FMJ Registered Member

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    It's the origninal engine. The heads are re-done, that was the recommendation of the machine shop so we just went with it. He decided to go all roller, so we will see how it works out.
     
  12. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I got a one piece block sitting on my floor for Someday ..... it wasn't a roller I believe , but will be by the time its ready for my Tan truck :D
     
  13. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    That isn't much cam for that motor. I would look for something with a little more lift. Like .480 or so. I have that much in my wheeling truck and it doesn't seem like too much. BTW I crawl rock not mud :D
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    It also said right in the package with the hydraulic roller lifters I've got, that prolonged idling isn't good with the retrofit lifters.

    That's another issue you don't deal with using stock stuff, that I think is total bunk for how much the roller cam/lifters cost from the aftermarket.
     

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