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  1. #1
    Senior Member
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    Default Help me pick a new cam

    632 Cube BBC Tall Deck
    Street car
    68 Camaro all steel

    Currently a World iron block and Merlin III heads
    Is running a solid roller
    Isky rockers and Pac valve springs
    with Stud Girdles

    10.7 : 1 JE Pistons (new)

    Fresh rebuild just last year

    Earlier this year a stud broke and I replaced all 16 but did not replace the rocker on which the stud broke

    That rocker must have been fatigued

    Yesterday it broke, but when it broke, it became loose and came away from it's pushrod. The other valve for that cylinder must have then come under significant pressure as it broke the retainer on that valve, the spring then jammed the rocker against the pushrod, which in turn went hard into the camshaft and "locked up" the engine. I was 5 mins from home and limped it home. In doing so I probably killed the cam (haven't pulled it down yet, but I can't bump start the engine past that lobe.

    It is a street car, but a loud and fast one. Will spend (and does) most of it's life in the 2300 to 5000 RPM range with occasional WOT over 5000. This is not my daily, it's a weekend fun car, so I don't mind it being a lumpy sound, shitty driving (bt not too obnoxious)

    Other info:
    Single plane intake
    1150 QFT
    2 1/4" Headers into 3" system
    TH400 Trans (3500 stall)
    3.55 Gear 9" Diff

    I'm going to move to a hydraulic roller and am far from an expert on what's best.

    Right now it's reasonably mild (World original 632 Crate motor) - they don't publish the specs, I even have emailed Bill Mitchel and he doesn't have the spec (engine bought in 2010).

    If I'm swapping it out might as well go for something a tad more aggressive.

    What brand and duration would you recommend?

    I am looking at this Voodoo (Lunati) thoughts? Anything else I should look at

    https://www.lunatipower.com/voodoo-hydr ... 2-300.html
    Hydraulic Roller Cam. Serious street/race cam. Needs 10.5:1 compression and 3200 RPM stall converter. Works with moderate nitrous and small superchargers. Very healthy idle quality. ; Advertised Duration (Int/Exh): 292/300; Duration @ .050 (Int/Exh): 241/249; Gross Valve Lift (Int/Exh): .625/.625; LSA/ICL: 110/106; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 2600-6200; Includes: Cam Only
    Chris

    68 Camaro 632 BBC Pro-touring

    Daily driver - 1961 Buick Bubbletop - not much horsepower, but smiles for miles

  2. #2
    Senior Member BasicQ's Avatar
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    Default Help me pick a new cam

    https://www.compcams.com/big-mutha-thumpr-243-257-hydraulic-roller-cam-for-chevrolet-big-block-gen-vi.html

    Sent from my iPad using Tapatalk
    Last edited by BasicQ; 20-10-2021 at 08:15 PM.

  3. #3
    Do you ever leave? EH179's Avatar
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    Default

    Unless you know what you have already, any suggestions are just guesses.

    You may end up buying the same/smaller.

  4. #4
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    Default

    ^^ Yes, you could take the old one and get it measured and then decide how much you want to upgrade from there.

  5. #5
    Part of the furniture 46Crab's Avatar
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    Default

    Quote Originally Posted by EH179 View Post
    Unless you know what you have already, any suggestions are just guesses.

    You may end up buying the same/smaller.
    ^^ makes total sense ^^

  6. #6
    Senior Member BasicQ's Avatar
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    Default

    Yep, excellent point made by EH179. Need to know starting point. I jumped the gun and went a mid sized cam with tight lobe center for the sound.

    Like you I couldn’t find the specs of circa 2010 but could find what they put in current 632 kits. Maybe that could help:

    [img]https://i.ibb.co/412MpXg/B50-C3123-9868-4-F9-D-88-A1-C3-C4-F5103-D5-E.jpg[/img]

    [img]https://i.ibb.co/94vcMSm/B902-E11-C-2651-40-AA-8003-334-D5675-B2-DB.jpg[/img]

    [img]https://i.ibb.co/0B61Ldy/460765-A0-29-F3-4-E58-85-E3-D70-E87-E35-DB5.jpg[/img]


    Sent from my iPad using Tapatalk

  7. #7
    Do you ever leave?
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    Default

    You could contact one, two or several of the many cam companies that will give a recommendation based on your combo and wants...

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