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Technical Sbc impractical Camshaft question

Discussion in 'The Hokey Ass Message Board' started by 327Eric, Jan 11, 2022.

  1. 327Eric
    Joined: May 9, 2008
    Posts: 2,116

    327Eric
    Member

    Ok, I dont want to spend money here, just want to use parts I have for todays version of my engine. The car is my 59 El camino, with a 4 speed and 3.54 gears.(I have a Posi if I get bored) I am finishing up a 383 build, and am stuck between 2 cams, a Lunati Voodoo,
    Hydraulic Flat Tappet. Advertised Duration (Int/Exh): 284/292; Duration @ .050 (Int/Exh): 241/249; Gross Valve Lift (Int/Exh): .525/.546; LSA/ICL: 110/106;
    Or the Summit 1108,244, 254 @ .050, .510,.533 lift, 114 Lsa
    https://static.summitracing.com/global/images/instructions/sum-1108 cam card.pdf
    The sole purpose of this is to keep me happy. not to go to the strip. I have an old rochester 3 deuce, and edelbrock inline dual afb intake, and an xc8 cross ram that i would like to play with, which is why I got the 114 Lsa cam, the voodoo was free. I plan to flog this and redline it like a teenager, and have the internals for that. I have read that some multi carb intakes like wider LSA, and would like opinions on which cam to use.my 1967 datecoded lifters on. 1980352_10202510972710413_5918551944126834399_o.jpg
     
    Deuces and Desoto291Hemi like this.
  2. seb fontana
    Joined: Sep 1, 2005
    Posts: 8,442

    seb fontana
    Member
    from ct

    I hope the lifters you have are performance Hyd to suit your "to flog this and redline it like a teenager" and not just stock. Where do you figure redline to be?
     
    ekimneirbo likes this.
  3. 327Eric
    Joined: May 9, 2008
    Posts: 2,116

    327Eric
    Member

    6200 to 6500 rpm with either of these cams
     
    oldiron 440 likes this.
  4. 427 sleeper
    Joined: Mar 8, 2017
    Posts: 2,865

    427 sleeper
    ALLIANCE MEMBER

    I'd be temped to run the Summit grind seeing you have the added cubic inches to absorb the duration. With multi carb's, the 114 LSA should make it easier to tune, theoretically it should have a better vacuum signal, which is a good thing. Comparing these two cams is kinda' like comparing apple's to orange's, IMO. A lot of variable's here.
     

  5. tomcat11
    Joined: Mar 31, 2010
    Posts: 821

    tomcat11
    Member

    I wouldn't run either without more rear gear ratio. Needs at least a 3:73. 4:11 would be better. But with only two choices I think the voodoo. What's the compression and cylinder heads?

    That 3 deuce set-up might look cool but it will choke that 383.
     
    Last edited: Jan 11, 2022
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  6. oldiron 440
    Joined: Dec 12, 2018
    Posts: 3,299

    oldiron 440
    Member

    Try to find a cam in the 230°@50 for extended street driving, either of those cam's won't pull until 3000 rpm....
     
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  7. 55blacktie
    Joined: Aug 21, 2020
    Posts: 793

    55blacktie

    Not enough information. Heads, compression, exhaust? For everything to work right, you have to look at everything and not be limited to choosing between just 2 cams. You're bound to leave something on the table if you don't, and you won't like the results. Unless looks are more important to you than performance, nix 3 x 2.
     
    54chevkiwi likes this.
  8. lostone
    Joined: Oct 13, 2013
    Posts: 2,820

    lostone
    Member
    from kansas

    I'd run the 114 lsa, smoother idle, easier to tune and still pull 6200.
     
  9. Baumi likes this.
  10. pitman
    Joined: May 14, 2006
    Posts: 5,148

    pitman

    Trips never seemed to
    Choke a 389" Poncho! ;)
    (Sounded great ‍)
     
  11. indyjps
    Joined: Feb 21, 2007
    Posts: 5,377

    indyjps
    Member

    Lunati Voodoo 284/292 adv dur 241/249 dur @ .050 .525/.546 lift

    Summit 1108 313/322 adv dur 244/254 dur @ .050 .508 / .533 lift

    That summit can is a whole lot of duration without the lift to go with it, that should have a very deep gear, big stall ( you have a 4 speed) and run from 4000-7000. Should be stable on drivetrain with "moderate lift" considering operating range. Really a strip cam where youre looking at rpm drop at gear change. I imagine it would be pretty awful on the street.

    As a point of reference, I ran a comp 292 for a while. 292/292 adv dur .501/.501 lift. 3500 stall 4.11 gear. Same deal, lotta duration to deal with without the benefit of higher lift. Took a lot of tuning to drive, loaded up all the time, but ran hard. Changed to a split pattern cam with a little less intake duration and more lift and ran faster. Don't recall the specs but it was in line with the lunati Voodoo.
     
    Last edited: Jan 12, 2022
    bobss396 and joel like this.
  12. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 5,216

    2OLD2FAST
    Member
    from illinois

    Probably depends mostly on your tolerance for poor street manners . With the 4-speed you'll be able to compensate somewhat , but again , what are you willing to sacrifice ?
     
  13. 327Eric
    Joined: May 9, 2008
    Posts: 2,116

    327Eric
    Member

    The engine was built to support the Voodoo cam. I just want advice on which will support the dual AFBs, or Rochester 2gs better
     
  14. the Voodoo will work better in almost all aspects. The summit cam is for the drag strip, just like @indyjps said for keeping RPM drop to a min at gear shift. That one will bite on the street and probably be awful on plugs with street driving.
     
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  15. RmK57
    Joined: Dec 31, 2008
    Posts: 2,659

    RmK57
    Member

    I say run it to redline and have fun with it, just don't get caught. 4.56 or 4.88 rear gear would be helpful in getting a 3600 lbs. El Camino moving.
     
  16. tomcat11
    Joined: Mar 31, 2010
    Posts: 821

    tomcat11
    Member

    The Pontiac tri power manifold is a different animal compared to the Edelbrock for SBC.

    What cylinder heads are you working with and what is the static compression ratio?

    There are many factors that determine a successful (fun) combination. All the components must work together to optimize performance. The engine components are no different and should be selected to work together and work with the car weight, transmission ratio's, rear gear, tire diameters, etc.

    A smaller cam with less duration as mentioned above is good advice with your combo.
     
  17. 327Eric
    Joined: May 9, 2008
    Posts: 2,116

    327Eric
    Member

    A smaller cam is always better, and I will go there, but there is some work to be done first , challenges to be faced, all in fun. After this stage is over I will go there
     
    Truckedup likes this.
  18. I would choose the VooDoo hue do for what you're doing, plus the quality of the cam would be better with less chance of flattening a lobe.
     
  19. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,263

    gimpyshotrods
    ALLIANCE MEMBER

    I had a cam that big in an 11:1 377 SBC, with a 4-speed and freeway gears, when I was a kid.

    That was my first experience with losing my license. I might have gotten jail if the dinosaur-era radar gun went up as high as I was going. Almost did not stop in time for the road block.

    I was young, and made poor decisions. I am older now.
     
  20. 327Eric
    Joined: May 9, 2008
    Posts: 2,116

    327Eric
    Member

    I thought I would follow up on this for anyone curious. After much searching, I took my own advice, found a cam that I liked and thought was perfect, the Summit 1107/Performer Rpm Grind, and then bought the size smaller Summit 1106, which is 234, 234 @050, .488 lift., 114 LSA.. I can add 1.6 rockers if necessary, but, will probably just leave it and enjoy it. At 50, I need to keep the 16 year old in me at bay, to a degree at least.
     
  21. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,263

    gimpyshotrods
    ALLIANCE MEMBER

    A wise choice.
     
  22. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,795

    jimmy six
    ALLIANCE MEMBER

    I’d have a copy of the 30-30 solid lifter “Duntov” with cast iron headers just so I could listen to it. A dual plane intake (no air gap) and an AFB too so I’m back in 1962. If I had to use an an Edelbrock Id remove the casts or the name on front of the carb too.
     

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