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Thread: SBC 350 rebuild to run on 87 octane, Daily Driver?
          
   
   

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  1. #1
    BigTruckDriver is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Dec 2004
    Location
    TX
    Car Year, Make, Model: hotrod
    Posts
    1,830

    SBC 350 rebuild to run on 87 octane, Daily Driver?

     



    I am to take the stock engine to have it rebuilt here in town. I am a little confused though on what I need done. I am looking to keep the engine running on 87 octane but squeeze what I can out of it. The guy up at the shop said they would resurface the heads and install flat tops along with a mellings MTC-1 cam and i would still be able to run 87 octane.
    cam specs for MTC-1
    Cam Style Hydraulic flat tappet
    Basic Operating RPM Range Idle-4,500
    Intake Duration at 050 inch Lift 204
    Exhaust Duration at 050 inch Lift 214
    Duration at 050 inch Lift 204 int./214 exh.
    Advertised Intake Duration 278
    Advertised Exhaust Duration 288
    Advertised Duration 278 int./288 exh.
    Intake Valve Lift with Factory Rocker Arm Ratio 0.420 in.
    Exhaust Valve Lift with Factory Rocker Arm Ratio 0.433 in.
    Valve Lift with Factory Rocker Arm Ratio 0.420 int./0.433 exh.
    Lobe Separation (degrees) 112
    Computer-Controlled Compatible No



    I am reading that I need to stay around 8.5-8.75CR to stay with 87 octane. My current compression is 8.50 to 1 or a little under with the stock engine.

    My current set up is with this as a daily driver.

    84 c-10 with a quadrajet
    rear end ratio, 2.73
    truck weight , 4000Lbs
    trans, turbo 350
    tires , 31" tall
    stock exhaust system, 2 pipes into one then cat and muffler.

    Engine Name: 350 LM1
    Horsepower: 249 HP @ 5,000 RPM
    Torque: 304 Ft/Lbs @ 3,500 RPM
    Compression Ratio: 8.50 to 1
    Block: 4 – Bolt, 2 Piece Rear Seal, 4.000” Bore
    Crankshaft: Cast Nodular 3.480” Stroke
    Heads: Cast Iron, 76cc
    Valves: 1.940” / 1.500”
    Camshaft lift: 0.390” / 0.410” Hydraulic
    Duration @ 0.050”: 195° / 202°

    A little confused on which set up would be best.
    Last edited by BigTruckDriver; 02-16-2012 at 09:28 PM.
    Friends dont let friends drive fords!

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