1981 Z/28 Speed Secrets Needed

Discussion in 'Camaro Questions' started by 70-SS/RS-L78, Dec 24, 2016.

  1. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

    25,260
    284
    Feb 26, 2004
    Bloomington, MN
    ^+1
    You might as well paint it Ferd blue while you've got your spray bomb finger in shape. ;)

    Vortec heads have a different bolt pattern in regards valve covers AND (even more importantly) the intake.
     
  2. Crazy4camaro

    Crazy4camaro Veteran Member

    200
    8
    Dec 30, 2015
    Greenville SC
    Vortec Bowtie Cylinder Head Technical Notes:
    • Cast-iron small runner or large runner cylinder heads*
    • 66cc combustion chambers
    • 0.450" deck thickness
    • Hardened exhaust valve seats
    • Machined for 2.000"/1.550" valves
    • Maximum 0.530" valve lift (without modifications)
    • Straight spark plug design
    • No heat risers
    • Drilled and tapped for 7/16"-14 screw-in studs
    • Dual bolt patterns for Vortec and early style intake manifolds
    (early model P/N 10051103; Vortec intakes P/N 12366573,
    12496820, 12496821, 12496822 or 12489371)
    • Use intake gasket P/N 89017465 for Vortec intakes or dual
    pattern intake gasket P/N 19301685 for early model intakes or
    Vortec design intake manifolds
    • Dual bolt patterns for perimeter-style and center-bolt
    valve covers
    • Vortec intake manifold three-step torque specs: 2 lb.-ft.;
    9 lb.-ft.; 11 lb.-ft.
    A. 19331470
    Small-Port Vortec Bowtie Cylinder Head Assembly
    • Completely assembled, ready to bolt on
    • 185cc intake ports
    • 65cc exhaust ports
    • Use Fel-Pro® P/N 1470 exhaust gasket
    • Bare head P/N 19331471, available separately
     
  3. 80sz

    80sz Veteran Member

    2,153
    143
    Feb 2, 2014
    Buffalo,n.y.
    Answered that! I thought you wrong also. Then again I'm a good parts swapper back yard hack. The straight plug design ,will that create problems with headers? The 81 computer,isn't it just a engine diagnostic thing? Other than turn on the lock up converter what's it actually do? Turns on the check engine light? I like the keep stock look but modify power plan. The stock trans didn't last too long after I did just what you're doing. If you do go 700 r4 I would try the 3.08 rear gears first before doing a swap to 3.42 or 73s. As is the 700 turns the 3.08 into almost a 3.42 and then you still got overdrive.
     
  4. 81BirdMan

    81BirdMan Veteran Member

    784
    5
    Jan 31, 2004
    Computer doesn't control the lockup. It controls ignition timing and the electronic Q-Jet.
     
  5. 80sz

    80sz Veteran Member

    2,153
    143
    Feb 2, 2014
    Buffalo,n.y.
    While the exterior of the 1981 Camaro was a carry over from the previous year, there were some significant changes under the hood. Most notably the CCC (Computer Command Control) emission system. This meant the 1981 Camaro was the only 2nd gen to have a "computer", which controlled the carburetor mixture, along with a "check engine" light and ALDL connector. The transmission now had a lock up torque converter, also controlled by the CCC.
     
  6. COPO

    COPO Veteran Member Lifetime Gold Member

    15,836
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    Sep 15, 1999
    Ontario, Canada
    I'd leave it the hell alone. My .02
     
  7. tom3

    tom3 Veteran Member

    10,627
    41
    Aug 1, 1999
    ohio
    Sure is a sharp car, leaving it alone is a good option, but... If it was mine I'd sure want it to have some go power. I'd go with the Bowtie vortec heads (use stock valve covers), Edelbrock Performer Plus cam, 1.6 rockers to get near .460 lift with low duration for a decent idle with the auto trans. Ditch the computer. Non-electric dialed in Qjet, standard distributor. Headers would be great, but sure ruin the sleeper look under the hood. OD auto transmission would be a must with lock up torque converter. Maybe use the stock computer to work with that - or aftermarket controller. Rear gear somewhere 3:41 to 3:73 or so. No reason that car can't be made to perform and still have the super clean & original stock look. Be a fun project too.
     
  8. tom3

    tom3 Veteran Member

    10,627
    41
    Aug 1, 1999
    ohio
    But wait, is that a 350 engine?
     

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