406 Camshaft Recommendation

Discussion in 'High Performance Modifications' started by MaineChevy, May 5, 2020.

  1. dcozzi

    dcozzi Veteran Member

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    I have a touch smaller one in my 406 but it is still pretty big. I also have 1.6 rockers so the lift is a bit higher. Your duration is longer. I'll bet that thing can suck through some mixture.

    Part Number: 119661 Grind Number: HR-230/359-2S-12.90 IG

    Good mid range torque and HP, fair idle, performance usage, 3600- 4400 cruise RPM, good with manifold nitrous system, 10.0 to 11.5 compression ratio advised. Good w/Roots supercharger, 15 lbs. maximum boost w/8.0 maximum compression ratio advised, .900&qu

    Lift:
    Intake @Cam 359 @Valve 539
    Exhaust @ Cam 372 @Valve 558
    Rocker Arm Ratio 1.50

    Cam Timing: TAPPET @ .004

    Lift: Opens Closes ADV Duration
    Intake 35.0 BTDC 77.0 ABDC 292 °
    Exhaust 83.0 BBDC 37.0 ATDC 300 °

    Recommended RPM range with matching components
    Minimum RPM 2600
    Maximum RPM 6600
    Valve Float 7000

    Cam Timing: TAPPET @.050
    Lift: Opens Closes Max Lift Duration
    Intake 8.0 BTDC 42.0 ABDC 107 230
    Exhaust 56.0 BBDC 2.0 ATDC 117 238
     
  2. MaineChevy

    MaineChevy New Member

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    I have no vacuum advance. It is an older Unilite style Mallory. I have been under the impression that V/A only helps with fuel economy or power during part throttle steady state. I do run fairly light springs.
     
  3. MaineChevy

    MaineChevy New Member

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    Is this a street car or street/strip? How does it drive/respond in the 1500-3000 rpm range?
     
  4. 80sz

    80sz Veteran Member

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    Street car. had almost 500+tq from 3500 to 5500. Max was 525tq 535hp. It’s not sluggish at all. They yanked off my vac advance which upset me but they know more , I am really close with 93 octane and 10.5 -1. 18int/36total. I’ve accidentally started off in third and forth gear from stop, if don’t buck just goes. It is cold blooded , don’t wanna idle for a few when colder out. Planning on getting 20 degree bushing for msd this is only issue I have is stinks up garage when cold and think little more initial clean it up and dial back idle screw some
     
  5. 70RSZ28hugger

    70RSZ28hugger Member

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    I have 406 2 bolt main GM block lunnati roller 565 lift e heads that is for sale /
    any takers motionjoe@gmail.com

    other wise here your cam that i recommend.
    comp cams
    CCA-CL12-246-3
     
  6. Richard Schultz

    Richard Schultz Veteran Member

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    Try the 272 duration intake and exhaust,.45 valve lift.
     
  7. 71 C10

    71 C10 New Member

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  8. 71 C10

    71 C10 New Member

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    Many of the responses are not addressing your desire for "I am looking for the most snap/acceleration/power between idle and 4000 rpm as I only drive the street". If that's important any cam with a HP peak over 5500 doesn't fit your requirement. but too short a cam is probably going to detonate at low RPM until you back the initial timing down which is also not optimum. With 10.2, iron heads and an idle to 4000 RPM wish makes cam selection critical. Need torque to peak around 3000.
    Also the fact that it's low end sluggish and runs cold (assuming a 180 degree thermostat) makes me wonder if the mixture is over rich. As far as vacuum advance goes I've had great results with an adjustable unit working off non ported vacuum. I was able to put in a a lot of extra vacuum idle advance that smooths out the idle and responds quickly going off idle. You need a compromise that drops off vac advance to initial mechanical quickly enough not to ping when you accelerate. It helps with idle adjustment also.
    400's don't need any expensive modification to make a great street motor.
     
  9. MaineChevy

    MaineChevy New Member

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    Ok. Thank you, I'll consider an HEI with vacuum advance. Coul you tell me the canister model #, how many turns in and what springs on the weights? When you say rich, would that be purely a pump cam adjustment, pump throw adjustment or jets. I have not changed the secondary opening ratio either. The biggest question I have as far as the cam goes is roller versus FT, lift and LSA. I have a 226/236 flat tappet 112 LSA now and am wondering if the switch to a roller 108 would benefit keeping the same duration. I'm pretty sure I'm in the ballpark with the 230 @ 50 duration given the c/r.
     
  10. 350camaro

    350camaro Veteran Member

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    If you decide to try a vacuum advance distributor another option is the MSD 8361 street pro-billet
     

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