Anyone ever run a zl1 can in a 496?

Discussion in 'High Performance Modifications' started by 76z28, Dec 17, 2012.

  1. 76z28

    76z28 Veteran Member

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    So I know the zl1 cam is not the new state of the art solid roller or the even newer 4 pattern can from comp but I do know is it sounds amazing! My car is only a weekend driver and well I'm finally back on my feet after having to repair my corvette. So I'm going to start my big block build within the next 3 months and was wondering if anyone has ran this cam in a 496.
    My plan:
    10:1 compression with afr305 heads
    Goal is around 6500 max rpm or so
     
  2. Air_Adam

    Air_Adam Veteran Member

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    Specs, for those of us not familiar?
     
  3. 76z28

    76z28 Veteran Member

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    Duration at .050 262/272
    Lift: .581/.622
    On a 109.5

    It seems like it should be easy on the valve train as well
     
  4. 1980RS

    1980RS Veteran Member

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    Better have some compression with that cam or the engine is going to be a dog. I have a friend with a home built iron head ZL-1 engine that he built back in the 70's, it's still going strong to this day and his 2nd gen is fast. His Camaro was the car to beat back in the day.
     
  5. 76z28

    76z28 Veteran Member

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    think 10:1 in a 496 is enough or should i have the heads milled when i buy them?
    was thinking since the extra cubes are there it will kinda make up for the lack of compression plus the extra half inch of stroke should help keep the bottom end up
     
  6. 1980RS

    1980RS Veteran Member

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    I know his engine is 12 to 1 and it sounds nasty. You could always go for the L88 cam, that one sounds pretty good and has a little less duration. I had one in a 396 and it performed pretty well. Both cams I think were like 4500 to 7500 rpm cams. You will need a loose converter.
     
  7. 76z28

    76z28 Veteran Member

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    Well on nitrous it'll stall at 4200 and with just my mild small block it stalls at 3500(so I would think 4000 with a big block)
    What are the specs on the L88? Can I get one from comp or anyone?
     
    Last edited: Dec 18, 2012
  8. rustbucket79

    rustbucket79 Veteran Member

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    On the plus side, it should be easy on parts, since the engine originally used stamped steel rocker arms. On the negative side, GM cams have increadibly long advertised durations compared to their .050 numbers. A modern cam will have a much smaller advertised vs. .050" duration ratio. A modern cam should have better street manners.

    The BBC is one engine family that can benefit from a roller cam, since it uses an extremely high rocker ratio coupled with the smallest diameter lifter. Given your self imposed rev limit, a hydraulic roller cam and short travel lifters will give you the performance you're looking for while reducing maintenance down to regular oil changes.
     
  9. hhott71

    hhott71 R.I.P 11/19/18 Lifetime Gold Member

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    Replacement for factory 430 HP 427 cu.in. (2nd design
    L88), ZL1 427 cu.in., LS7 454 cu.in. camshaft.
    BluePrinted Series Grind #3959180 4400-7200 rpm
    131141 Cam part#, 99250-16 lifters
    262/272 @0.050" 110 LC 0.022/.024" lash .575/.615" lift




    Replacement for 400 HP 427 cu.in. (1st design L) camshaft.
    BluePrinted Series Grind #3925535 4400-7200 rpm
    968561 cam part#, 99250-16 lifters
    264/269 @ 0.050" 112 LC .024/0.026" lash .560/.580" lift


    That is from CRANES Latest catalog (that I have, 2011)
    The Cams above and below these cams recommend a MINIMUM of 12.0:1 Compression.

    Next smaller cam/
    Rough idle, performance usage, good upper RPM HP,
    480+ cu.in., Pro Street, bracket racing, auto trans
    w/3500+ converter, 4400-4800 cruise RPM, also good
    w/manifold nitrous system, good upper RPM HP, 12.0
    minimum compression ratio advised. Good w/large
    Roots supercharger, 20 lbs. maximum boost w/8.0
    maximum compression ratio advised.
    260/268 @ 0.050" 114 LC 0.026/0.026" Lash .628/648" lift
    You can get the same cam with LC too

    All these are solid flat tappet cams.

    There are 2 Roller cams with cast iron dist gear that are close. They are the largest ones listed 2in the catalog with the iron gear.
    254/262 @ 0.050" 112LC .636/.636" lift.
    They list the next with the same timing and .714/.714"" lift.
     
  10. 1980RS

    1980RS Veteran Member

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    That's funny, my Crane blueprint L88 cam is on a 114° LCA. At least that's what the card said. I did get it back in the late 80's
     

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