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Thread: flat tappet vs roller

  1. #1
    Senior Member EXPERT BUILDER
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    flat tappet vs roller

    What do you guys think if I switch my current combo:
    383,13-1,.558 int,.550 ex,260,266@.050 comp flat tappet,stock 215 Dart Iron Eagle Platinums,Manley 6 inch rods,Super Victor port matched,750 APD Alky carb, in my 3100 lb 68 camaro,to a COMP ROLLER#12-906-9,.276,.284@.050,.630,.630@107?How much H.P. do you think this roller will gain,if any?

  2. #2
    Senior Member MASTER BUILDER
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    camshaft

    May I ask what gear and tire, do you run 1/8 or 1/4 also how much rpm do you want to turn your motor. Later J.Smith 4621 racing

  3. #3
    Senior Member EXPERT BUILDER
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    I use a 4.56,9x30 with 94 inch rollout phoenix slick and run 7000 in the 1/4

  4. #4
    Senior Member RACING JUNKIE
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    I'd say an easy 50Hp over what you got now, maybe more.

    Everything you mentioned in your combo is screaming for a solid roller cam.
    You won't be disappointed.
    JMO>Cp
    ***IN GOD WE TRUST***

  5. #5
    Senior Member RACING JUNKIE
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    I'm not in disagreement with Charles on this, but i did a similar swap about 9 yrs. ago in a 406", from a .595 lift flat tappet cam to a .625 roller 106 lobe ctrs. spent close to $1,000.00 and only gained 1/10, but i have to admit i've never in my life time of racing seen a better flat tappet cam than the .595 bullit cam which i still own. My friend Jimmy Smith can verify this because he knows when i did it. There's no question in my mind that the roller should run better, it just did not do that in my combination @ 3250 lbs.

    Zip.

  6. #6
    Senior Member MASTER BUILDER
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    camshaft

    My opinion probly will make more HP but not in the usable range. two things i say 60' will be slower , This cam should be in a 2500lb car turning 7500-7800 put a 255-263 or 260-265 @50 and you will like it a lot more. Facts with my car 3200 lbs 5.38 gear and 97"rollout tire Later J.Smith 4621 racing

  7. #7
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by zipper06
    I'm not in disagreement with Charles on this, but i did a similar swap about 9 yrs. ago in a 406", from a .595 lift flat tappet cam to a .625 roller 106 lobe ctrs. spent close to $1,000.00 and only gained 1/10, but i have to admit i've never in my life time of racing seen a better flat tappet cam than the .595 bullit cam which i still own. My friend Jimmy Smith can verify this because he knows when i did it. There's no question in my mind that the roller should run better, it just did not do that in my combination @ 3250 lbs.

    Zip.
    I think the roller I mentioned won't work..I'm considering Comp's 12-920-9,which is 260,264@.050,.660,630 with a 106....My current flat tappet combo runs 10.32@130 @2000 ft in a 3125 68 camaro.I agree with you zip about rollers,I don't want to spend $1000 for a tenth.I was hoping for a .15 to.2 gain,if not I won't change to roller.

  8. #8
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by et7333
    Quote Originally Posted by zipper06
    I'm not in disagreement with Charles on this, but i did a similar swap about 9 yrs. ago in a 406", from a .595 lift flat tappet cam to a .625 roller 106 lobe ctrs. spent close to $1,000.00 and only gained 1/10, but i have to admit i've never in my life time of racing seen a better flat tappet cam than the .595 bullit cam which i still own. My friend Jimmy Smith can verify this because he knows when i did it. There's no question in my mind that the roller should run better, it just did not do that in my combination @ 3250 lbs.

    Zip.
    I think the roller I mentioned won't work..I'm considering Comp's 12-920-9,which is 260,264@.050,.660,630 with a 106....My current flat tappet combo runs 10.32@130 @2000 ft in a 3125 68 camaro.I agree with you zip about rollers,I don't want to spend $1000 for a tenth.I was hoping for a .15 to.2 gain,if not I won't change to roller.
    USE 1.6 ROCKERS AND BRING THAT LIFT UP IN THE 680'S.CALL COMP CAM'S AND TELL THEM YOUR CAR COMBO AND HAVE THEM GRIND A CAM FOR YOU.THATS WHAT I DID IT COST ALITTLE MORE BUT WELL WORTH IT.JUST MY 2 CENTS.


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