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Thread: cam size

  1. #1
    Senior Member EXPERT BUILDER
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    cam size

    im buillding a 468 street/strip and i was wondering what cam size yall thibk i should run im thinkin abou a 274/286 duration with 552/ 555 comp extreme energy flat tappet

    sound good?
    pray for our soldiers our freedom and rain

  2. #2
    Senior Member RACING JUNKIE
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    IMPOSSIBLE TO ANSWER WITHOUT COMPRESSION, HEADS, INTAKE, INTENDED RPM range etc

  3. #3
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    his heads are gonna be stock, but ported with a calce job, and milled a few cc down
    its prolly gonna be anywhere from about 9.5 to 10.5
    rpm airgap dual plane
    and 2500 to 6500 thereabouts

    this is just from what i was told he was gonna do, he might have changed his mind

  4. #4
    Senior Member RACING JUNKIE
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    IT DOES NO GOOD TO HAVE A BIG Cam that the heads won't support.

    Duration @ .050 is what you need to look at, rather than advertised duration. If it were me I'd keep that in the 230 -240 range. The more duration you have the more compression you will need. Too much camshaft duration will bleed off a lot of cylinder preasure at low rpm. Not a good thing with a street driven vehicle with low compression.

    BUT....
    Since it's a big block it will have torque on the botton so you will probably get away with a little more... Just my opinion...I'm no camshaft guy by any means.

  5. #5
    Senior Member EXPERT BUILDER
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    ya stock heads good port and valve job flat top pistons and either airgap or rpm performer and yes 2500 to4500 rpm so you think im goiong with too high of a duration
    pray for our soldiers our freedom and rain

  6. #6
    Senior Member RACING JUNKIE
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    Quote Originally Posted by txhunter69
    ya stock heads good port and valve job flat top pistons and either airgap or rpm performer and yes 2500 to4500 rpm so you think im goiong with too high of a duration
    I don't know...what is the duration @ .050? NOT advertised duration...if that IS @ .050 then YES MOST DEFINITELY TOO MUCH.

  7. #7
    Senior Member EXPERT BUILDER
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    this is the specs off summit
    Brand: COMP Cams
    Product Line: COMP Cams Xtreme Energy Cam and Lifter Kits
    Part Type: Camshaft and Lifter Kits
    Part Number: CCA-CL11-246-3
    Cam Style: Hydraulic flat tappet
    Basic Operating RPM Range: 1,800-6,000
    Intake Duration at 050 inch Lift: 230
    Exhaust Duration at 050 inch Lift: 236
    Duration at 050 inch Lift: 230 int./236 exh.
    Advertised Intake Duration: 274
    Advertised Exhaust Duration: 286
    Advertised Duration: 274 int./286 exh.
    Intake Valve Lift with Factory Rocker Arm Ratio: 0.552 in.
    Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.555 in.
    Valve Lift with Factory Rocker Arm Ratio: 0.552 int./0.555 exh. lift
    Lobe Separation (degrees): 110
    Intake Valve Lash: 0.000 in.
    Exhaust Valve Lash: 0.000 in.
    Grind Number: CB XE274H-10
    Computer-Controlled Compatible: No
    Lifters Included: Yes
    Lifter Style: Hydraulic flat tappet
    Valve Springs Included: No
    Retainers Included: No
    Locks Included: No
    Valve Stem Seals Included: No
    Timing Chain and Gears Included: No
    Assembly Lubricant Included: Yes
    Pushrods Included: No
    Rocker Arms Included: No
    Gaskets Included: No
    Quantity: Sold as a kit.

    Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 274/286, Lift .552/.555, Chevy, Big Block, Kit
    pray for our soldiers our freedom and rain

  8. #8
    Senior Member EXPERT BUILDER
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    ok see it right there
    it has the duration and it has the duration at 50
    which is mid 230s which it good
    easy mistake to make though
    cam specs can get confusing sometimes, to many numbers make head hurt lol

  9. #9
    Senior Member RACING JUNKIE
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    That should be good for what you have in my opinion.

  10. #10
    Member JUNIOR BUILDER
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    your combo is quite similar to mystreet rod engine which has a cam like the one you are thinking of using.It works well.


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