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cam springs

  1. #1
    BTC cardcarrying member SuperSoaker's Avatar
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    Default cam springs

    I'm running a set of AFR springs now that was set at #160/165 on the seat.

    just tested them and they are at #155/160 now. Should I replace them???

    the cam is a HR 242/248 at 50 646/646

    I was just told that they should be set at #125/130 on the seat for that cam
    is this true????


    cam designer said #160/165
    local machinist said #125/130
    Last edited by SuperSoaker; 02-17-2009 at 03:27 PM.

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  3. #2
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    If they are Morels I would opt for the 160# seat. 120#-130# is to light with a BBC valve train.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

  4. #3
    cfm
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    5 psi loss is nothing.

    Every HR lifter will be fine with that seat psi. It's the over the nose that can play havoc since theycan be anywhere from 300-400 and more. What is yours ? That's just as important.

    Don't run 130 with that cam unless running low rpms which obviously you won't be.

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  6. #4
    Senior Member MACHINEHEAD1's Avatar
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    Thats a great Comp Cams grind. And easy on the parts. Current spring preasures should get you to 6100 with no float. Run um'. If its the AFR spring I think it is, you will be 410lbs over the nose.

  7. #5
    BTC cardcarrying member SuperSoaker's Avatar
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    Thanks everyone for the help

    Yes they are the AFR springs. Bob Marada (RM Builder) had them set up for his Custom cam. The cam worked great for the Ex. that I was running.

    The spring compressor that I used only went to #400 Will be checking over the nose pressure this weekend.

  8. #6
    New Guy
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    What type of exhausts were you running? Do you know if that kind of duration and lift have reversion problems with a set of Lightning headers?

  9. #7
    Senior Member SkyHarborCowboy's Avatar
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    Quote Originally Posted by MACHINEHEAD1 View Post
    Thats a great Comp Cams grind. And easy on the parts. Current spring preasures should get you to 6100 with no float. Run um'. If its the AFR spring I think it is, you will be 410lbs over the nose.
    Which grind would that be?

    Joe
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

  10. #8
    BTC cardcarrying member SuperSoaker's Avatar
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    Quote Originally Posted by Sledge Hammer View Post
    What type of exhausts were you running? Do you know if that kind of duration and lift have reversion problems with a set of Lightning headers?

    Bassett Tri-Y water jacketed. Had no problem at all with reversion

    Bob designed the cam around the headers

    If you have any questions call Bob he is a great guy Marine Kinetics (sp) 585-654-8583

  11. #9
    Senior Member MACHINEHEAD1's Avatar
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    Pull up Comp Cams Lobe Profiles on the web. Marine Hyd. Roller (High Lift). I like these because they have generous seat timing, great .200 numbers and a good lift figure for the AFR heads to get into their lift window. Area under the curve is where these profiles really shine. All things considered, the best for continuous rpm use.

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